North Korea says it has successfully carried out its fifth nuclear test.
The announcement on state media came hours after a seismic event was detected near its nuclear test site.
South Korea believes it is the North’s biggest-ever test, raising fears it has made significant nuclear advances.
South Korean President PARK GEUN-HYE called it an act of “self-destruction” showing the “maniacal recklessness” of leader KIM JONG-UN.
The US warned of “serious consequences”.