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N Korea 'has miniature nuclear warhead' North Korea 'has miniature nuclear warhead', says Kim Jong-un
(35 minutes later)
North Korea has made miniature nuclear warheads to fit on its ballistic missiles, says leader Kim Jong-un North Korea has developed miniaturised nuclear warheads which can be mounted on ballistic missiles, the country's leader Kim Jong-un has claimed.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. North Korean state media has said before that nuclear warheads have been miniaturised, but this is the first time Mr Kim has been quoted directly.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. The validity of the country's nuclear boasts has been widely questioned.
The notoriously secretive state said it detonated a hydrogen bomb in January, but experts dispute the claim.