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North Korea warned of 'serious consequences' after nuclear test

12 February 2013 Last updated at 07:28 GMT

North Korea says it has successfully carried out its third underground nuclear test, in a widely-anticipated move set to draw international condemnation.

Pyongyang said the test involved a "miniaturised" device and was carried out in a "perfect manner".

The UN had warned of "significant consequences" if Pyongyang went ahead.

The BBC's Lucy Williamson reports from Seoul.