North Korea said it successfully tested a powerful nuclear bomb on Wednesday, drawing threats of further sanctions even though the United States and weapons experts voiced doubts the device was as advanced as the isolated nation claimed.
The underground explosion shook the earth so hard that it registered as a seismic event with U.S. earthquake monitors. It put pressure on China to rein in neighboring North Korea.
The U.N. Security Council said it would begin working immediately on significant new measures in response to North Korea, a threat diplomats said could mean an expansion of sanctions.
North Korea has been under Security Council sanctions since it first tested an atomic device in 2006. After a nuclear test in 2013, the Security Council took about three weeks to agree a resolution that tightened financial restrictions and cracked down on Pyongyang's attempts to ship and receive banned cargo.
www.reuters.com/article/us-northkorea-nuclear-idUSKBN0UK0G420160106