16 gunmen killed in Thai military base attack: army

NARATHIWAT, Thailand: In one of the most deadly attacks in Thailand's long-running insurgency, scores of heavily-armed gunmen stormed a southern army base on Wednesday, leaving 16 militants dead, authorities said.

In the unusually brazen early-morning assault, 100 militants, dressed in army fatigues and armed with AK47 and M16 assault rifles, attacked the unit in Narathiwat province, unit commander Captain Somkiat Pholprayoon said.

"Sixteen militants were confirmed dead after the attack," he told reporters at the scene, adding that the military and police were in "hot pursuit" of the 60 to 70 militants who fled the base after the attack.

The government expressed sorrow over the deaths, one of the highest single death tolls in some eight years of violence in Thailand's deep south, but praised the military operation, saying the army have had no choice.

"The government has no policy of using violence to deal with southern unrest but in this incident (militants) attacked the military base," Deputy Prime Minister Chalerm Yubamrung told reporters in Bangkok.

A shadowy insurgency has been fighting for greater autonomy for the country's southernmost provinces since 2004, with shootings and bombings occurring on a near-daily basis.

More than 5,500 people have been killed, both Buddhist and Muslim, in the bloody conflict.

Chalerm, who heads the government's special body in charge of the southern unrest, recently proposed imposing a curfew in certain areas of the most affected provinces.

"If we impose a curfew, then militants will find it more difficult to enter the area," he said on Wednesday.

Religious leaders oppose the move, saying it will do nothing to solve the underlying problems. The Thai cabinet is set to discuss the proposal on Friday.

Critics accuse the government of failing to address the grievances of Thailand's Malay Muslim minority, including alleged abuses by the military and a perceived lack of respect for their ethnic identity, language and religion.

Members of Thailand's security forces are frequently targeted in ambushes and roadside bombs, but organised attacks on military bases are relatively rare.

No military casualties were reported in the early hours assault at the base in the Bacho district of Narathiwat province, one of three Muslim-dominated provinces near the border with Malaysia. An army spokesman had earlier put the militants' death toll at 17.

"We learned of the attack in advance from defected militants," Colonel Pramote Promin, southern army spokesman told Thai television.

He added that a key local leader of the fighters, who wore bulletproof vests during the attack, had been killed in the clashes.

Southern army commander Lieutenant General Udomchai Thammasarorat called for local villagers to stay in their homes for 24-hours, for their "safety and to prevent any confusion during the pursuit of militants", he told broadcaster Thai PBS.

A report by the International Crisis Group on the violence in December said insurgents had grown "bolder and stronger" amid political inaction from successive Bangkok governments.

The attack on Wednesday is "part of a trend" towards bigger, bolder attacks by militants showing a new "willingness on the part of militants to engage the security forces head on," said Matthew Wheeler, an ICG South East Asia analyst.

"The fact that so many militants were killed is very unusual," he said, adding the last time there was such a high death toll was in April 2004.

The ICG report recommended a greater push towards decentralisation and closer engagement with local civil society groups and peace negotiations with insurgents.

It added that the deployment of 60,000 security forces and an emergency decree "have not achieved any appreciable decline in casualties".

- AFP/al

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Raman to lead BJP to a hat-trick in Chhattigarh, says Rajnath Singh

RAIPUR: Bharatiya Janata Party president Rajnath Singh gave Chief minister Raman Singh a pat on the back for introducing the unique Food Security Act and other welfare schemes saying that he would lead the party to score a hat-trick in the upcoming assembly elections.

Talking to newsmen here on his arrival here to attend a meeting of Bharatiya Janata Yuva Morcha (BJYM), he said Chhattisgarh has set a milestone with the enactment of a legislation to ensure food security through an efficient public distribution system.

"Next assembly polls, under leadership of chief minister Raman Singh, will see that BJP scoring a hat-trick", he added.

Referring to the UPA government at the centre, the BJP chief said all its economic policies have miserably failed, leading to price rise and putting the country's economy on the down slide.

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Study questions kidney cancer treatment in elderly

In a stunning example of when treatment might be worse than the disease, a large review of Medicare records finds that older people with small kidney tumors were much less likely to die over the next five years if doctors monitored them instead of operating right away.

Even though nearly all of these tumors turned out to be cancer, they rarely proved fatal. And surgery roughly doubled patients' risk of developing heart problems or dying of other causes, doctors found.

After five years, 24 percent of those who had surgery had died, compared to only 13 percent of those who chose monitoring. Just 3 percent of people in each group died of kidney cancer.

The study only involved people 66 and older, but half of all kidney cancers occur in this age group. Younger people with longer life expectancies should still be offered surgery, doctors stressed.

The study also was observational — not an experiment where some people were given surgery and others were monitored, so it cannot prove which approach is best. Yet it offers a real-world look at how more than 7,000 Medicare patients with kidney tumors fared. Surgery is the standard treatment now.

"I think it should change care" and that older patients should be told "that they don't necessarily need to have the kidney tumor removed," said Dr. William Huang of New York University Langone Medical Center. "If the treatment doesn't improve cancer outcomes, then we should consider leaving them alone."

He led the study and will give results at a medical meeting in Orlando, Fla., later this week. The research was discussed Tuesday in a telephone news conference sponsored by the American Society of Clinical Oncology and two other cancer groups.

In the United States, about 65,000 new cases of kidney cancer and 13,700 deaths from the disease are expected this year. Two-thirds of cases are diagnosed at the local stage, when five-year survival is more than 90 percent.

However, most kidney tumors these days are found not because they cause symptoms, but are spotted by accident when people are having an X-ray or other imaging test for something else, like back trouble or chest pain.

Cancer experts increasingly question the need to treat certain slow-growing cancers that are not causing symptoms — prostate cancer in particular. Researchers wanted to know how life-threatening small kidney tumors were, especially in older people most likely to suffer complications from surgery.

They used federal cancer registries and Medicare records from 2000 to 2007 to find 8,317 people 66 and older with kidney tumors less than 1.5 inches wide.

Cancer was confirmed in 7,148 of them. About three-quarters of them had surgery and the rest chose to be monitored with periodic imaging tests.

After five years, 1,536 had died, including 191 of kidney cancer. For every 100 patients who chose monitoring, 11 more were alive at the five-year mark compared to the surgery group. Only 6 percent of those who chose monitoring eventually had surgery.

Furthermore, 27 percent of the surgery group but only 13 percent of the monitoring group developed a cardiovascular problem such as a heart attack, heart disease or stroke. These problems were more likely if doctors removed the entire kidney instead of just a part of it.

The results may help doctors persuade more patients to give monitoring a chance, said a cancer specialist with no role in the research, Dr. Bruce Roth of Washington University in St. Louis.

Some patients with any abnormality "can't sleep at night until something's done about it," he said. Doctors need to say, "We're not sticking our head in the sand, we're going to follow this" and can operate if it gets worse.

One of Huang's patients — 81-year-old Rhona Landorf, who lives in New York City — needed little persuasion.

"I was very happy not to have to be operated on," she said. "He said it's very slow growing and that having an operation would be worse for me than the cancer."

Landorf said her father had been a doctor, and she trusts her doctors' advice. Does she think about her tumor? "Not at all," she said.

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Online:

Kidney cancer info: http://www.cancer.net/cancer-types/kidney-cancer

and http://www.cancer.gov/cancertopics/types/kidney

Study: http://gucasym.org

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Marilynn Marchione can be followed at http://twitter.com/MMarchioneAP

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Charred Human Remains Found in Burned Cabin

Investigators have located charred human remains in the burned out cabin where they believe suspected cop killer and ex-LAPD officer Christopher Dorner was holed up as the structure burned to the ground, police said.

The human remains were found within the debris of the burned cabin and identification will be attempted through forensic means, the San Bernardino County Sheriff-Coroner Department said in a press release early this morning.

Dorner barricaded himself in the cabin in the San Bernardino Mountains near Big Bear Tuesday afternoon after engaging in a gunfight with police, killing one officer and injuring another, the San Bernardino County Sheriff's Department said.

Cindy Bachman, spokeswoman for the San Bernardino County Sheriff's Department, which is the lead agency in the action, said Tuesday night investigators would remain at the site all night.

FULL COVERAGE: Christopher Dorner Manhunt

When Bachman was asked if police thought Dorner was in still in the burning cabin, she said, "Right… We believe that the person that barricaded himself inside the cabin engaged in gunfire with our deputies and other law enforcement officers is still inside there, even though the building burned."

Bachman spoke shortly after the Los Angeles Police Department denied earlier reports that a body was found in the cabin, contradicting what law enforcement sources told ABC News and other news organizations.

Christopher Dorner Manhunt: Police Exchange Fire With Possible Suspect Watch Video

Fugitive Ex-Cop Believed Barricaded in Cabin, California Cops Say Watch Video

Police around the cabin told ABC News they saw Dorner enter but never leave the building as it was consumed by flames, creating a billowing column of black smoke seen for miles.

A press conference is scheduled for later today in San Bernardino.

One sheriff's deputy was killed in a shootout with Dorner earlier Tuesday afternoon, believed to be his fourth and victim after killing an LAPD officer and two other people this month, including the daughter of a former police captain, and promising to kill many more in an online manifesto.

PHOTOS: Former LAPD Officer Suspected in Shootings

Cops said they heard a single gunshot go off from inside the cabin just as they began to see smoke and fire. Later they heard the sound of more gunshots, the sound of ammunition being ignited by the heat of the blaze, law enforcement officials said.

Police did not enter the building, but exchanged fire with Dorner and shot tear gas into the building.

One of the largest dragnets in recent history, which led police to follow clues across the West and into Mexico, apparently ended just miles from where Dorner's trail went cold last week.

Police got a break at 12:20 p.m. PT, when they received a 911 call that a suspect resembling Dorner had broken into a home in the Big Bear area, taken two hostages and stolen a car.

The two hostages, who were tied up by Dorner but later escaped, were evaluated by paramedics and were determined to be uninjured.

Rick Heltebrake told ABC News Radio that Dorner had "a big rifle" when he stole his truck.

"[Dorner] said I don't want to hurt you just get out and start walking up the road and take your dog with you. He was calm. I was calm. I would say I was in fear for my life but there was no panic.

Officials say Dorner crashed the stolen vehicle and fled on foot to the cabin where he barricaded himself and exchanged fire with deputies from the San Bernardino Sheriff's Office and state Fish and Game officers.

Two deputies were wounded in the firefight and airlifted to a nearby hospital, where one died, police said. The second deputy was in surgery and was expected to survive, police said.

Police sealed all the roads into the area, preventing cars from entering the area and searching all of those on the way out. Are schools were briefly placed on lockdown.

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North Korea conducts third nuclear test, angering U.S., Japan

SEOUL (Reuters) - North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, angering the United States and Japan and prompting its only major ally, China, to call for calm.

The North said the test had "greater explosive force" than the 2006 and 2009 tests that were widely seen as small-scale. Its KCNA news agency said it had used a "miniaturized" and lighter nuclear device, indicating that it had again used plutonium which is more suitable for use as a missile warhead.

North Korean leader Kim Jong-un, the third of his line to rule the country, has presided over two long-range rocket launches and a nuclear test during his first a year in power, pursuing policies that have propelled his impoverished and malnourished country closer to becoming a nuclear weapons power.

U.S. President Barack Obama termed the test a "highly provocative act" that hurt regional stability.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies," Obama said in a statement.

Japanese Prime Minister Shinzo Abe said the test was a "grave threat" that could not be tolerated. U.N. Secretary-General Ban Ki-moon said the test was a "clear and grave violation" of U.N. Security Council resolutions.

China, which has shown signs of increasing exasperation with its neighbor, repeated calls for the "denuclearization" of the Korean peninsula and urged its client state and others to react calmly, while pressing Pyongyang not to ramp up tension further, something the North had threatened in the run-up to the test.

"We strongly urge North Korea to abide by its non-nuclear commitment and not to take any further actions that would worsen the situation", it said in a statement.

South Korea, still technically at war with the North after the 1950-53 civil war ended in a mere truce, said the size of the seismic activity indicated a nuclear explosion slightly larger than the North's two previous tests at 6-7 kilotons, although that is still relatively small. The Hiroshima bomb was around 20 kilotons.

The U.S. Geological Survey said that a seismic event measuring 5.1 magnitude had occurred on Tuesday, with North Korea later confirming the nuclear test.

"It was confirmed that the nuclear test that was carried out at a high level in a safe and perfect manner using a miniaturized and lighter nuclear device with greater explosive force than previously did not pose any negative impact on the surrounding ecological environment," KCNA said.

The test prompted the U.N. Security Council to call for an emergency meeting later on Tuesday. Despite the tame official response, it likely to be a major embarrassment for Beijing, the North's sole major economic and diplomatic ally.

"The test is hugely insulting to China, which now can be expected to follow through with threats to impose sanctions," said Mark Fitzpatrick of the International Institute for Strategic Studies think tank.

North Korea trumpeted the announcement on its state television channel to patriotic music against the backdrop of an image of its national flag.

It linked the test to its technical prowess in launching a long-range rocket in December, a move that triggered the U.N. sanctions, backed by China, that Pyongyang said prompted it to carry out Tuesday's nuclear test.

The North's ultimate aim, Washington believes, is to design an intercontinental ballistic missile capable of carrying a nuclear warhead that could hit the United States. North Korea says the program is aimed merely at putting satellites in space.

North Korea used plutonium in previous nuclear tests and prior to Tuesday there had been speculation it would use highly enriched uranium so as to conserve its plutonium stocks as testing eats into its limited supply of the material that could be used to construct a nuclear bomb.

"VICIOUS CYCLE"

Despite its three nuclear tests and long-range rocket tests, North Korea is not believed to be close to manufacturing a nuclear missile capable of hitting the United States.

Japan immediately called for more sanctions against North Korea and South Korea's defense ministry said additional nuclear tests and rocket launches by the North should not be ruled out.

South Korea's Yonhap news agency said Pyongyang had informed China and the United States of its plans to test on Monday, although this could not be confirmed.

When new leader Kim, now aged 30, took power after his father's death in December 2011, there were hopes the he would bring reforms and end Kim Jong-il's "military first" policies.

Instead of which, the North, whose economy is smaller than it was 20 years ago and where a third of children are believed to be malnourished, appears to be trapped in a cycle of sanctions followed by further provocations.

"The more North Korea shoots missiles, launches satellites or conducts nuclear tests, the more the U.N. Security Council will impose new and more severe sanctions," said Shen Dingli, a professor and regional security expert at Shanghai's Fudan University.

"It is an endless, vicious cycle."

But options for the international community appear to be in short supply, as North Korea is already one of the most heavily sanctioned states on earth.

Tuesday's action appeared to have been timed for the run-up to February 16 anniversary celebrations of Kim Jong-il's birthday, as well as to achieved maximum international attention.

Significantly, the test comes at a time of political transition in China, Japan and South Korea, and as Obama begins his second term. He will likely have to tweak his State of the Union address due to be given on Tuesday.

Japanese Prime Minister Shinzo Abe is bedding down a new government and South Korea's new president, Park Geun-hye, prepares to take office on February 25.

China too is in the midst of a once-in-a-decade leadership transition to Xi Jinping, who takes office in March. Both Abe and Xi are staunch nationalists.

The longer-term game plan from Pyongyang may be to restart talks aimed at winning food and financial aid.

Its puny economy and small diplomatic reach mean the North struggles to win attention on the global stage - other than through nuclear tests and attacks on South Korea, last made in 2010.

"Now the next step for North Korea will be to offer talks... - any form to start up discussion again to bring things to their advantage," said Jeung Young-tae, senior research fellow at the Korea Institute for National Unification in Seoul.

(Additional reporting by Jack Kim, Christine Kim and Jumin Park in SEOUL; Linda Sieg in TOKYO; Louis Charbonneau at the UNITED NATIONS; Fredrik Dahl in VIENNA; Michael Martina in BEIJING; Editing by Nick Macfie)

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Catholic Church in S'pore surprised by Pope Benedict XVI's sudden resignation

SINGAPORE: The Catholic Church in Singapore is reeling from the news of Pope Benedict XVI's sudden resignation. The 85-year-old pontiff announced on Monday that he will step down on February 28, and cited age as the main factor for his decision.

Pope Benedict XVI is the first pontiff to resign in centuries, and Catholics in Singapore are still trying to come to terms with this break in tradition.

"I'm really surprised because normally Popes, they live and do their duties until God calls them back home," said a local Catholic.

The news also shocked the head of Singapore's Catholic Church, Archbishop Nicholas Chia.

He said: "Well, we're all very surprised by the announcement by Pope Benedict XVI about his resignation. We never expected it. But definitely he has been thinking about it, and with such serious reasons, he is taking the step."

Calling the outgoing Pope a brilliant man and a great academic, Archbishop Chia said he has also made great contributions to the Catholic Church.

"We're all very grateful to him for all he has done during his pontificate since 2005, and contributing so much to the church. We are sorry to lose him. But at the same time, we know that it is for the good of the church, for the future. So we pray for him," added Archbishop Chia.

Church leaders in Singapore said the Pope's resignation shows great humility.

Eugene Vaz, the Vicar-General of the Catholic Archdiocese of Singapore, said: "I think (this is an) encouraging note to all Catholics in Singapore. An inspirational moment also... We've got a leader who's really caring. Not just for himself but for the Church, and ready to take the steps to make sure that the Church would move on, continue being relevant.

"As he himself says, at his age, he finds it difficult to keep pace with the quick changes that are taking place in the world. So you need somebody who would be more adept to that. And he feels his time is over."

Monsignor Vaz added that the Pope will be remembered for his strong leadership and as a champion of Catholic tradition.

-CNA/ac

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Joint Parliamentary Committee questions CBI director on 2G prosecutor's removal

NEW DELHI: CBI director Ranjit Sinha was on Tuesday quizzed by Opposition members about the removal of the prosecutor in the 2G case during a meeting of the Joint Parliamentary Committee examining the scam.

Sinha is learnt to have told the Committee, chaired by PC Chacko, that the veracity of the purported taped conversations between CBI prosecutor AK Singh and Unitech Managing Director Sanjay Chandra was yet to be established.

CBI had removed Singh from the 2G spectrum case after he was caught in an alleged taped conversation discussing prosecution strategy with Chandra.

As Sinha appeared before the JPC examining the alleged irregularities in allocation of 2G spectrum, questions on the removal of Singh were first put to him by opposition members.

The CBI chief's testimony was slated as one of the last presentations to the JPC along with that of telecom secretary R Chandrashekhar.

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Pope shows lifetime jobs aren't always for life

The world seems surprised that an 85-year-old globe-trotting pope who just started tweeting wants to resign, but should it be? Maybe what should be surprising is that more leaders his age do not, considering the toll aging takes on bodies and minds amid a culture of constant communication and change.

There may be more behind the story of why Pope Benedict XVI decided to leave a job normally held for life. But the pontiff made it about age. He said the job called for "both strength of mind and body" and said his was deteriorating. He spoke of "today's world, subject to so many rapid changes," implying a difficulty keeping up despite his recent debut on Twitter.

"This seemed to me a very brave, courageous decision," especially because older people often don't recognize their own decline, said Dr. Seth Landefeld, an expert on aging and chairman of medicine at the University of Alabama at Birmingham.

Age has driven many leaders from jobs that used to be for life — Supreme Court justices, monarchs and other heads of state. As lifetimes expand, the woes of old age are catching up with more in seats of power. Some are choosing to step down rather than suffer long declines and disabilities as the pope's last predecessor did.

Since 1955, only one U.S. Supreme Court justice — Chief Justice William Rehnquist — has died in office. Twenty-one others chose to retire, the most recent being John Paul Stevens, who stepped down in 2010 at age 90.

When Thurgood Marshall stepped down in 1991 at the age of 82, citing health reasons, the Supreme Court justice's answer was blunt: "What's wrong with me? I'm old. I'm getting old and falling apart."

One in 5 U.S. senators is 70 or older, and some have retired rather than seek new terms, such as Hawaii's Daniel Akaka, who left office in January at age 88.

The Netherlands' Queen Beatrix, who just turned 75, recently said she will pass the crown to a son and put the country "in the hands of a new generation."

In Germany, where the pope was born, Chancellor Angela Merkel, who is 58, said the pope's decision that he was no longer fit for the job "earns my very highest respect."

"In our time of ever-lengthening life, many people will be able to understand how the pope as well has to deal with the burdens of aging," she told reporters in Berlin.

Experts on aging agreed.

"People's mental capacities in their 80s and 90s aren't what they were in their 40s and 50s. Their short-term memory is often not as good, their ability to think quickly on their feet, to execute decisions is often not as good," Landefeld said. Change is tougher to handle with age, and leaders like popes and presidents face "extraordinary demands that would tax anybody's physical and mental stamina."

Dr. Barbara Messinger-Rapport, geriatrics chief at the Cleveland Clinic, noted that half of people 85 and older in developed countries have some dementia, usually Alzheimer's. Even without such a disease, "it takes longer to make decisions, it takes longer to learn new things," she said.

But that's far from universal, said Dr. Thomas Perls, an expert on aging at Boston University and director of the New England Centenarians Study.

"Usually a man who is entirely healthy in his early 80s has demonstrated his survival prowess" and can live much longer, he said. People of privilege have better odds because they have access to good food and health care, and tend to lead clean lives.

"Even in the 1500s and 1600s there were popes in their 80s. It's remarkable. That would be today's centenarians," Perls said.

Arizona Sen. John McCain turned 71 while running for president in 2007. Had he won, he would have been the oldest person elected to a first term as president. Ronald Reagan was days away from turning 70 when he started his first term as president in 1981; he won re-election in 1984. Vice President Joe Biden just turned 70.

In the U.S. Senate, where seniority is rewarded and revered, South Carolina's Strom Thurmond didn't retire until age 100 in 2002. Sen. Robert Byrd of West Virginia was the longest-serving senator when he died in office at 92 in 2010.

Now the oldest U.S. senator is 89-year-old Frank Lautenberg of New Jersey. The oldest congressman is Ralph Hall of Texas who turns 90 in May.

The legendary Alan Greenspan was about to turn 80 when he retired as chairman of the Federal Reserve in 2006; he still works as a consultant.

Elsewhere around the world, Cuba's Fidel Castro — one of the world's longest serving heads of state — stepped down in 2006 at age 79 due to an intestinal illness that nearly killed him, handing power to his younger brother Raul. But the island is an example of aged leaders pushing on well into their dotage. Raul Castro now is 81 and his two top lieutenants are also octogenarians. Later this month, he is expected to be named to a new, five-year term as president.

Other leaders who are still working:

—England's Queen Elizabeth, 86.

—Abdullah bin Abd al-Aziz al-Saud, king of Saudi Arabia, 88.

—Sabah al-Ahmad al-Jaber al-Sabah, emir of Kuwait, 83.

—Ruth Bader Ginsburg, U.S. Supreme Court associate justice, 79.

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Associated Press writers Paul Haven in Havana, Cuba; David Rising in Berlin; Seth Borenstein, Mark Sherman and Matt Yancey in Washington, and researcher Judy Ausuebel in New York contributed to this report.

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Marilynn Marchione can be followed at http://twitter.com/MMarchioneAP

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North Korea Says it Has Conducted a Nuclear Test

North Korea says it has successfully tested a miniaturized nuclear device Tuesday, according to state media.

A large tremor measured at magnitude 4.9 was detected in North Korea and governments in the region scrambled to determine whether it was a nuclear test that the North Korean regime has vowed to carry out despite international protests.

Official state media said the test was conducted in a safe manner and is aimed at coping with "outrageous" U.S. hostility that "violently" undermines the North's peaceful, sovereign rights to launch satellites. Unlike previous tests, North Korea used a powerful explosive nuclear bomb that is smaller and lighter, state media reported.

President Obama called the test "a highly provocative act" in a statement Tuesday morning.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies,"Obama said.

"The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region," he added.

The U.N. Security Council will hold an emergency meeting on North Korea's nuclear test later this morning.

Suspicions were aroused when the U.S. Geological Survey said it had detected a magnitude 4.9 earthquake Tuesday in North Korea.

The Comprehensive Test Ban Treaty Organization told ABC News, "We confirm that a suspicious seismic event has taken place in North Korea."

North Korea Threatens More Nuclear Tests, Warns U.S. Watch Video

"The event shows clear explosion-like characteristics and its location is roughly congruent with the 2006 and 2009 DPRK (North Korea) nuclear tests," said Tibor Toth, executive secretary of the organization.

"If confirmed as a nuclear test, this act would constitute a clear threat to international peace and security, and challenges efforts made to strengthen global nuclear disarmament and non-proliferation," Toth said in a statement on the organization's web site.

Kim Min-seok, a South Korean Defense Ministry spokesman, told reporters that North Korea informed United States and China that it intended to carry out another nuclear test, according to the AP. But U.S. officials did not respond to calls from ABC News Monday night.

The seismic force measured 6 to 7 kilotons, according to South Korea.

"Now that's an absolutely huge explosion by conventional terms. It's a smallish, but not tiny explosion by nuclear terms. It's about two-thirds the size of the bomb that the U.S. dropped on Hiroshima," James Acton, a Senior Associate at the Carnegie Endowment for International Peace, told ABC News.

North Korea threatened in January to carry out a "higher-level" test following the successful Dec. 12 launch of a long range rocket. At the time, North Korea's leader Kim Jong-Un said his country's weapons tests were specifically targeting the United States.

The suspicious tremor comes just hours before President Obama is to give the State of the Union address, and it marks the first diplomatic test in the region for new Secretary of State John Kerry.

Also, South Korea's new president, Park Geun-hye, is scheduled to be sworn in on Feb. 25. One of North Korea's biggest holidays, Kim Jong-il's birthday, falls on Feb. 16.

China, North Korea's main ally in the region, has warned North Korea it would cut back severely needed food assistance if it carried out a test. Each year China donates approximately half of the food North Korea lacks to feed its people and half of all oil the country consumes.

Both of North Korea's previous tests used a plutonium-based method for making bomb fuel. The first was deemed a failure, the second only slightly less so. If the most recent test used HEU (highly enriched uranium), a far more difficult-to-detect method of producing bomb fuel, it would be a significant and worrisome step forward for North Korea's weapons program.

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Gunbattle rocks Gao after rebels surprise French, Malians

GAO, Mali (Reuters) - Islamist insurgents launched a surprise raid in the heart of the Malian town of Gao on Sunday, battling French and local troops in a blow to efforts to secure Mali's recaptured north.

Local residents hid in their homes or crouched behind walls as the crackle of gunfire from running street battles resounded through the sandy streets and mud-brick houses of the ancient Niger River town, retaken from Islamist rebels last month by a French-led offensive.

French helicopters clattered overhead and fired on al Qaeda-allied rebels armed with AK-47s and rocket-propelled grenades who had infiltrated the central market area and holed up in a police station, Malian and French officers said.

The fighting inside Gao was certain to raise fears that pockets of determined Islamists who have escaped the lightning four-week-old French intervention in Mali will strike back with guerrilla attacks and suicide bombings.

After driving the bulk of the insurgents from major northern towns such as Timbuktu and Gao, French forces are trying to search out their bases in the remote and rugged Adrar des Ifoghas mountains, far up in the northeast.

But with Mali's weak army unable to secure recaptured zones, and the deployment of a larger African security force slowed by delays and kit shortages, vast areas to the rear of the French forward lines now look vulnerable to guerrilla activity.

"They infiltrated the town via the river. We think there were about 10 of them. They were identified by the population and they went into the police station," said General Bernard Barrera, commander of French ground operations in Mali.

He told reporters in Gao that French helicopters had intervened to help Malian troops pinned down by the rebels, who threw grenades from rooftops.

Malian gendarme Colonel Saliou Maiga told Reuters the insurgents intended to carry out suicide attacks in the town.

SUICIDE BOMBERS

No casualty toll was immediately available. But a Reuters reporter in Gao saw one body crumpled over a motorcycle. Malian soldiers said some of the raiders may have come on motorbikes.

The gunfire in Gao erupted hours after French and Malian forces reinforced a checkpoint on the northern outskirts that had been attacked for the second time in two days by a suicide bomber.

Abdoul Abdoulaye Sidibe, a Malian parliamentarian from Gao, said the rebel infiltrators were from the MUJWA group that had held the town until French forces liberated it late last month.

MUJWA is a splinter faction of al Qaeda's North African wing AQIM which, in loose alliance with the home-grown Malian Islamist group Ansar Dine, held Mali's main northern urban areas for 10 months until the French offensive drove them out.

Late on Saturday, an army checkpoint in Gao's northern outskirts came under attack by a group of Islamist rebels who fired from a road and bridge that lead north through the desert scrub by the Niger River to Bourem, 80 km (50 miles) away.

"Our soldiers came under heavy gunfire from jihadists from the bridge ... At the same time, another one flanked round and jumped over the wall. He was able to set off his suicide belt," Malian Captain Sidiki Diarra told reporters.

The bomber died and one Malian soldier was lightly wounded, he added. In Friday's motorbike suicide bomber attack, a Malian soldier was also injured.

Diarra described Saturday's bomber as a bearded Arab.

Since Gao and the UNESCO World Heritage city of Timbuktu were retaken last month, several Malian soldiers have been killed in landmine explosions on a main road leading north.

French and Malian officers say pockets of rebels are still in the bush and desert between major towns and pose a threat of hit-and-run guerrilla raids and bombings.

"We are in a dangerous zone... we can't be everywhere," a French officer told reporters, asking not to be named.

One local resident reported seeing a group of 10 armed Islamist fighters at Batel, just 10 km (6 miles) from Gao.

OPERATIONS IN NORTHEAST

The French, who have around 4,000 troops in Mali, are now focusing their offensive operations several hundred kilometers (miles) north of Gao in a hunt for the Islamist insurgents.

On Friday, French special forces paratroopers seized the airstrip and town of Tessalit, near the Algerian border.

From here, the French, aided by around 1,000 Chadian troops in the northeast Kidal region, are expected to conduct combat patrols into the Adrar des Ifoghas mountains.

The remaining Islamists are believed to have hideouts and supply depots in a rugged, sun-blasted range of rocky gullies and caves, and are also thought to be holding at least seven French hostages previously seized in the Sahel.

The U.S. and European governments back the French-led operation as a defense against Islamist jihadists threatening wider attacks, but rule out sending their own combat troops.

To accompany the military offensive, France and its allies are urging Mali authorities to open a national reconciliation dialogue that addresses the pro-autonomy grievances of northern communities like the Tuaregs, and to hold democratic elections.

Interim President Dioncounda Traore, appointed after a military coup last year that plunged the West African state into chaos and led to the Islamist occupation of the north, has said he intends to hold elections by July 31.

But he faces splits within the divided Malian army, where rival units are still at loggerheads.

(Additional reporting by Tiemoko Diallo and Adama Diarra in Bamako; Writing by Joe Bavier and Pascal Fletcher; Editing by Kevin Liffey)

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