The US, South Korea and Japan have said they will be united in their response to North Korea’s claim to have successfully tested a hydrogen bomb. North Korea said it carried out the test on Wednesday – if confirmed it would be its fourth nuclear test, and its first of the more powerful H-bomb.
The UN Security Council has also agreed to start drawing up new measures against North Korea. But scepticism remains over whether the North really did conduct such a test.
Experts have said the seismic activity generated by the blast was not large enough for it to have been a full thermonuclear explosion. The White House said President Barack Obama had spoken separately to South Korea’s President Park Geun-Hye and Japan’s Prime Minister Shinzo Abe. They “agreed to work together to forge a united and strong international response to North Korea’s latest reckless behavior”, it said in a statement (BBC News, 2015).