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.

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 ...

North Korea released a statement early Wednesday asserting that they have successfully tested a hydrogen bomb, “a measure for self-defence the DPRK has taken to firmly protect the sovereignty of the ...

North Korea claims that it tested a hydrogen bomb on Sunday, reports Reuters. If true, it represents a major escalation in the region, and highlights the growing sophistication of the nation's nuclear ...

Javascript is required for you to be able to read premium content. Please enable it in your browser settings. A senior North Korean official has issued a stern ...