North Korea says it has conducted a "nuclear warhead explosion" designed to counter alleged hostility from the United States.
The country's fifth and seemingly largest nuclear test caused a 5.3-magnitude seismic event and was described by South Korea as "maniacal recklessness".
A state TV announcer in the North confirmed the detonation at the Pyunggye-ri nuclear test site. She said: "Our ... party sent a congratulatory message to our nuclear scientists ... for conducting the successful nuclear warhead explosion test."
Pyongyang said the success of the test - which drew immediate international condemnation - meant it could produce "at will a variety of smaller, lighter and diversified nuclear warheads of higher strike power". It claimed there was no radioactive leakage or adverse environmental impact.http://news.sky.com/story/53-magnitude-earthquake-reported-near-north-korea-nuclear-site-10570458