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Article snippet: SEOUL, South Korea — North Korea carried out its sixth and most powerful nuclear test on Sunday, saying it had detonated a hydrogen bomb that could be mounted on an intercontinental ballistic missile. The test, which the North called a “complete success,” came hours after Pyongyang claimed to have developed such a weapon. It was an extraordinary show of defiance by the country’s leader, Kim Jong-un, against President Trump, who has threatened to bring “fire and fury” to the North if it continues to threaten the United States with nuclear missiles. It was the North’s first blast to clearly surpass the destructive power of the bombs dropped on the Japanese cities of Hiroshima and Nagasaki in World War II. Still, it was unclear whether the North had in fact detonated a hydrogen bomb, a far more powerful weapon than the atomic bombs it has tested in the past. And analysts were skeptical that Pyongyang had really developed the capability to mount one on an ICBM. The United States Geological Survey estimated that the tremor set off by the blast, detected at 12:36 p.m. at the Punggye-ri underground test site in northwestern North Korea, had a magnitude of 6.3. The South Korean Defense Ministry’s estimate was much lower, at 5.7, but even that would mean a blast “five to six times” as powerful as the North’s last nuclear test, a year ago, said Lee Mi-sun, a senior analyst at the South Korean Meteorological Administration. The blast was so powerful that the first tremor wa... Link to the full article to read more