North Korea says it carried out H-bomb test; experts cast doubts

SEOUL, Korea, Republic Of -- Soon after the ground shook around its nuclear testing facility, North Korea trumpeted its first hydrogen bomb test -- a powerful, self-proclaimed "H-bomb of justice" that would mark a major and unanticipated advance for its still-limited nuclear arsenal.

See Full Article

Pyongyang's announcement Wednesday was met with widespread skepticism, but whatever the North detonated in its fourth nuclear test, another round of tough international sanctions looms for the defiant, impoverished country.

The test likely pushed Pyongyang's scientists and engineers closer to their goal of building a warhead small enough to place on a missile that can reach the U.S. mainland. But South Korea's spy agency thought the estimated explosive yield from the explosion was much smaller than what even a failed H-bomb detonation would produce.

The test was met with a burst of jubilation and pride in Pyongyang. A North Korean television anchor, reading a typically propaganda-heavy statement, said a test of a "miniaturized" hydrogen bomb had been a "perfect success" that elevated the country's "nuclear might to the next level."

A large crowd celebrated in front of Pyongyang's main train station as the announcement was read on a big video screen, with people taking videos or photos of the screen on their mobile phones and applauding and cheering.

In Seoul and elsewhere there was high-level worry. South Korean President Park Geun-hye ordered her military to bolster its combined defence posture with U.S. forces and called the test a "grave provocation" and "an act that threatens our lives and future." Japanese Prime Minister Shinzo Abe said, "We absolutely cannot allow this."

Washington and nuclear experts have been skeptical about past North Korean claims about H-bombs, which are much more powerful and much more difficult to make, than atomic bombs. A confirmed test would further worsen already abysmal relations between Pyongyang and its neighbours and lead to a strong push for tougher sanctions on North Korea at the United Nations. The Security Council quickly announced an emergency meeting.

A successful H-bomb test would be a big advance. Fusion is the main principle behind the hydrogen bomb, which can be hundreds of times more powerful than atomic bombs that use fission. In a hydrogen bomb, radiation from a nuclear fission explosion sets off a fusion reaction responsible for a powerful blast and radioactivity.

A South Korean lawmaker said the country's spy agency told him in a private briefing that Pyongyang may not have conducted an H-bomb test given the relatively small size of the seismic wave reported.

An estimated explosive yield of 6.0 kilotons and a quake with a magnitude of 4.8 (the U.S. reported 5.1) were detected, lawmaker Lee Cheol Woo said the National Intelligence Service told him. That's smaller than the estimated explosive yield of 7.9 kilotons and a quake with a magnitude of 4.9 that were reported after the 2013 nuclear test, he said, and only a fraction of the hundreds of kilotons that a successful H-bomb test's explosion would usually yield. Even a failed H-bomb detonation typically yields tens of kilotons, the NIS told Lee, who sits on the parliament's intelligence committee.

A miniaturized H-bomb can trigger a weak quake, but only the U.S. and Russia have such H-bombs, Lee cited the NIS as saying.

While also noting the quake was likely too small for an H-bomb test, Jaiki Lee, a professor of nuclear engineering at Seoul's Hanyang University, said the North could have experimented with a "boosted" hybrid bomb that uses some nuclear fusion fuel along with more conventional uranium or plutonium fuel.

After North Korean leader Kim Jong Un bragged of H-bomb capabilities in December, nuclear expert Jeffrey Lewis also questioned Pyongyang's ability to build such a bomb.

But, he wrote on the North Korea-focused 38 North website, "The North has now had a nuclear weapons program for more than 20 years. This program has yielded three nuclear tests. North Korean nuclear scientists have access to their counterparts in Pakistan, possibly Iran and maybe a few other places. We should not expect that they will test the same fission device over and over again."

In Pyongyang the announcement was greeted with an expected rush of nationalistic pride, and some bewilderment.

Kim Sok Chol, 32, told The Associated Press that he doesn't know much about H-bombs, but added that "Since we have it the U.S. will not attack us."

University student Ri Sol Yong, 22, said, "If we didn't have powerful nuclear weapons, we would already have been turned into the slaves of the U.S."

It could take weeks before the true nature of the test is confirmed by outside experts -- if they are able to do so at all. North Korea goes to great lengths to conceal its tests by conducting them underground and tightly sealing off tunnels or any other vents though which radioactive residue and blast-related noble gases could escape into the atmosphere.

U.S. Air Force aircraft designed to detect the evidence of a nuclear test could be deployed from a U.S. base on the Japanese island of Okinawa. Japanese media said Tokyo has also mobilized its own reconnaissance aircraft for sorties over the Sea of Japan to try to collect atmospheric data.

The test was unexpected in part because North Korea's previous nuclear test was in early 2013 and Kim Jong Un did not mention nuclear weapons in his annual New Year's speech. Some outside analysts speculated Kim was worried about deteriorating ties with China, the North's last major ally, which has shown greater frustration at provocations and a possible willingness to allow stronger UN sanctions.

Chinese Foreign Ministry spokeswoman Hua Chunying told reporters that Beijing "firmly opposes" Pyongyang's purported test and is monitoring the environment on its border with North Korea near the test site.

Just how big a threat North Korea's nuclear program poses is a mystery. North Korea is thought to have a handful of rudimentary nuclear bombs and has spent decades trying to perfect a multistage, long-range missile to eventually carry smaller versions of those bombs.

Some analysts say the North hasn't likely achieved the technology needed to manufacture a miniaturized warhead that could fit on a long-range missile capable of hitting the U.S. mainland. But there is a growing debate on just how far the North has advanced in its secretive nuclear and missile programs.

North Korea needs fresh nuclear tests for practical military and political reasons. To build a credible nuclear program, the North must explode new nuclear devices -- including miniaturized ones -- so its scientists can continually improve their designs and technology. Nuclear-tipped missiles could then be used as deterrents, and diplomatic bargaining chips, against its enemies -- and especially against the United States, which Pyongyang has long pushed to withdraw its troops from the region and to sign a peace treaty formally ending the Korean War.

"This is indeed a wakeup call," Lassina Zerbo, the head of the Vienna-based UN Comprehensive Test Ban Treaty Organization, which has a worldwide network of monitoring stations to detect nuclear testing, told AP by phone. "I am convinced it will have repercussions on North Korea and international peace and stability."

AP correspondent Hyung-jin Kim and writer Kim Tong-hyung in Seoul, Pyongyang bureau chief Eric Talmadge in Tokyo, and writer George Jahn in Vienna contributed to this story.



Advertisements

Latest Canada & World News

  • Police detain Islamic State suspects in Spain, Britain, Germany

    World News CTV News
    MADRID -- Police on Wednesday arrested six suspected members of the Islamic State group, four in Spain and one each in Britain and Germany, Spain's Interior Ministry said. A ministry statement said the man arrested in Britain was a Salafist imam who led the group and who was sought by several countries. Source
  • Fish market owner upset by large lobster TSA photo

    World News CTV News
    OLD SAYBROOK, Conn. -- The owner of a Connecticut fish market says she is "personally offended" after she saw a photo of a 9-kilogram lobster being handled by a Transportation Security Administration screener on social media. Source
  • Solitary confinement under scrutiny as Ottawa moves to limit use of controversial practice

    Canada News CBC News
    Locked up in solitary confinement for 43 days last year at the maximum security Edmonton Institution, Matthew Hamm's only view of the world outside his cell was through a mail slot. And even then the only thing he could see was a brick prison wall. Source
  • No more coffee breaks: Pilot schooled after touching down next to P.E.I. Tim Hortons

    Canada News Toronto Sun
    O’LEARY, P.E.I. — A coast guard helicopter pilot has been schooled on the appropriate use of the aircraft after touching down in a field near a Tim Hortons in P.E.I. for a coffee fix. The chopper landed in a barren field in the small Island community on March 16, prompting surprised onlookers to take to social media with comments about the unusual sighting and photos of the red aircraft whipping up poofs of snow as it set down. Source
  • U.K. prosecutors charge 6 over 1989 Hillsborough stadium disaster

    World News Toronto Sun
    British prosecutors have charged six people over the 1989 Hillsborough stadium disaster in Sheffield, in which 96 soccer fans were crushed to death. Those charged include the police commander on the day, David Duckenfield, who is accused of gross negligence manslaughter. Source
  • Pilot schooled on proper chopper use after touching down next to Tim Hortons

    Canada News CTV News
    O'LEARY, P.E.I. -- A coast guard helicopter pilot has been schooled on the appropriate use of the aircraft after touching down in a field near a Tim Hortons in P.E.I. for a coffee fix. The chopper landed in a barren field in the small Island community on March 16, prompting surprised onlookers to take to social media with comments about the unusual sighting and photos of the red aircraft whipping up poofs of snow as it set down. Source
  • Police helicopter attacks Venezuela's Supreme Court

    World News Toronto Sun
    CARACAS, Venezuela — A police helicopter fired on Venezuela’s Supreme Court and Interior Ministry in what President Nicolas Maduro said was a thwarted “terrorist attack” aimed at ousting him from power. The confusing exchange, which is bound to ratchet up tensions in a country already paralyzed by months of deadly anti-government protests, took place as Maduro was speaking live on state television Tuesday. Source
  • 'That stuff lives with you': Juror advocate says Saretzky jury has tough road ahead

    Canada News CTV News
    LETHBRIDGE, Alta. - The jury in gruesome Alberta triple murder trial has a difficult road ahead even after they finish their deliberations, says a former juror who suffered post-traumatic stress disorder from his time in the jury box. Source
  • U.K. prosecutors charge 6 in 1989 Hillsborough stadium deaths

    World News CBC News
    British prosecutors charged six people Wednesday in the 1989 Hillsborough stadium disaster in which 96 soccer fans died, many of them crushed to death — the first criminal charges in the tragedy that changed English soccer forever. Source
  • Ransomware attack hits property arm of France bank BNP Paribas

    World News CBC News
    A global cyberattack has hit the property arm of France's biggest bank BNP Paribas, one of the largest financial institutions known to be affected by an extortion campaign that started in Russia and Ukraine before spreading. Source