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 ...

The test likely pushed Pyongyang's scientists and engineers closer to their goal of building a warhead small enough to place on a missile that can reach the U.S. mainland. But South Korea's spy agency ...

SEOUL, South Korea (AP) — Soon after the ground shook around its nuclear testing facility, North Korea trumpeted its first hydrogen bomb test — a powerful, self-proclaimed "H-bomb of justice" that ...

BEIJING (Reuters) - British Foreign Secretary Philip Hammond said on Wednesday a test of a hydrogen nuclear bomb by North Korea would be a "provocation which I condemn without reservation" and a ...

SEOUL, South Korea — North Korea carried out its sixth and most powerful nuclear test early Sunday in an extraordinary show of defiance against President Donald Trump, who responded by declaring the ...

Most, if not all, of the crew members of a Japanese fishing boat inundated by radioactive fallout from a U.S. hydrogen bomb ...

TOKYO - North Korea on Wednesday claimed it had successfully tested a hydrogen bomb, a claim that, if true, would mark a huge step forward in its nuclear capability. 'We've carried out a hydrogen bomb ...