View photosDiagram shows a simplified summary of the H-bomb; 2c x 4 inches; 96.3 mm x 101 mm;More

TOKYO (AP) — North Korea says it successfully detonated a hydrogen bomb in its latest nuclear test Sunday. Outside experts haven’t been able to verify that claim, but say it’s plausible. If true, it would represent a major step forward in North Korea’s effort to develop a nuclear weapon capable of reaching the United States.

MORE POWERFUL THAN AN A-BOMB

A hydrogen bomb can be far more powerful than the atomic bombs the U.S. dropped on Japan in World War II. The U.S. conducted the first successful tests of hydrogen bombs in the 1950s. Their yields of 10,000 kilotons and more were several hundred times larger than the

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