N Korea nuclear: US, Japan, S Korea pledge united response

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.

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Source: bbc.com

Image credit: AFP