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North Korea nuclear test: Hydrogen bomb 'missile-ready'
| The secretive communist state said its sixth nuclear test was a "perfect success", hours after seismologists had detected an earth tremor. | By BBC News 8-3-17 |
Pyongyang said it had tested a hydrogen bomb - a device many times more powerful than an atomic bomb.
Analysts say the claims should be treated with caution, but its nuclear capability is clearly advancing.
