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North Korea said it successfully tested a powerful nuclear bomb on Wednesday, drawing criticism from world powers even though experts and the U.S. government doubt that the isolated nation's atomic weapons capability is as advanced as Pyongyang claims.It was the fourth time that North Korea has exploded a nuclear device. While a nuclear test had long been expected, North Korea's assertion that it exploded a hydrogen device, much more powerful than an atomic bomb, came as a surprise. The White House said North Korea might not in fact have tested a hydrogen bomb. North Korea has been under U.N. Security Council sanctions since it first tested an atomic device in 2006 and could face additional measures.Joe Cirincione, a nuclear expert who is president of Ploughshares Fund, a global security organisation, said North Korea may have mixed a hydrogen isotope in a normal atomic fission bomb.The USGS reported a 5.1 magnitude quake that South Korea said was 49 km (30 miles) from the Punggye-ri site where the North has conducted nuclear tests in the past.
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