Nuclear test monitors in Vienna say the undergroundexplosion had double the force of the last test, in 2009, despite the use of a device said by the North to be smaller.
Nuclear test monitors based in Vienna say the undergroundexplosion had double the force of the last test, in 2009, despite the use of a device said by the North to be smaller.
Pyongyang is angry about ongoing U.S.-South Korean military drills and about new U.N. sanctions, issued over the North's December long-range rocket launch, which the U.N. called a cover for a banned missile test, and its third underground nuclear explosion, conducted Feb. 12.
North Korea confirmed the test after international monitors recorded seismic activity consistent with a powerful undergroundexplosion at 11:57 (02:57 GMT) on Tuesday.