SEOUL, South Korea (AP) — North Korea said it set off a hydrogen bomb Sunday in its sixth nuclear test, which judging by the earthquake it set off appeared to be its most powerful explosion yet. South ...

SEOUL, South Korea (AP) – North Korea says it has conducted a hydrogen bomb test. The surprise announcement that complicates already difficult efforts to curb the country’s push for a working nuclear ...

The UN Security Council has tentatively set an emergency meeting after North Korea’s H-bomb test.2:10 p.m. Crowds dressed in thick winter coats have gathered outside a large video screen near a ...

SEOUL, South Korea — North Korea says it has conducted a hydrogen bomb test. The surprise announcement that complicates already difficult efforts to curb the country's push for a working nuclear ...

TOKYO -- North Korea announced it detonated a thermonuclear device Sunday in its sixth and most powerful nuclear test to date, a big step toward its goal of developing nuclear weapons capable of ...

SEOUL/WASHINGTON (Reuters) - North Korea on Sunday conducted its sixth and most powerful nuclear test, which it said was of an advanced hydrogen bomb for a long-range missile, prompting the threat of ...

The White House says the U.S. government's early analysis of underground activity in North Korea "is not consistent" with that country's claim of having conducted a successful hydrogen bomb test.