The secretive Communist state said its sixth nuclear test was a "perfect success ", hours after seismologists had detected an earth tremor .
Pyongyang said it had tested a hydrogen bomb - a device many times more powerful than a atomic bomb.
North Korea last carried out a nuclear test in September 2016.
It has defied UN sanctions and international pressure to develop nuclear weapons .
Source: http://www.bbc.co.uk/news/world-asia-41139445
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