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Experts doubt North Korea's bomb was hydrogen-powered

Experts doubt North Korea's bomb was hydrogen-powered

The bold claim by North Korea on Wednesday that it had detonated a hydrogen bomb appeared to fizzle under the intense scrutiny of U.S. physicists and nuclear weapons experts.

The explosive power detected by earthquake sensors around the world was much weaker than would be expected from a hydrogen bomb, experts said.

“It was not very big,” said Philip Coyle, the former director of nuclear weapons testing at the Nevada Test Site and a longtime U.S. national security official.

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