SEOUL, South Korea — 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 would ...

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 Alaska Earthquake Center says its equipment picked up seismic activity after North Korea's claimed detonation of a hydrogen bomb Tuesday. But the seismic reaction is almost the same as the seismic ...

Richard Garwin, who has died aged 97, was an American nuclear scientist who designed the world’s first hydrogen bomb and went on to become a presidential adviser on arms control, while helping to lay ...

Some analysts questioned whether Wednesday's test was indeed of a hydrogen device. North Korea said it had successfully conducted a test of a miniaturised hydrogen nuclear device on Wednesday morning, ...

Richard L. Garwin, an architect of America’s hydrogen bomb, who shaped defense policies for postwar governments and laid the groundwork for insights into the structure of the universe as well as for ...