SEOUL – North Korea has successfully detonated a nuclear device in the Northeastern province of Hamgyong, causing an explosion with a magnitude of 5.1, geological surveys in China and the U.S. said.

The detonation originated at a depth of about 1 kilometer in Kilju County, North Hamgyong Province, 378km (235mi) NE of Pyongyang at 1157KST and attracted strong condemnation from the U.S., China and Russia.