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White House analysis casts doubt on North Korea's nuclear test claims

North Korea says it has successfully conducted a test of a miniaturised hydrogen nuclear device on Wednesday morning.

However, the White House has said initial analysis of the reported nuclear test is not consistent with claims of a successful hydrogen bomb.

In a statement the country said it would continue to strengthen its nuclear programme as long as the US maintained what it called "its stance of aggression."

Much of the international community has condemned North Korea after the claim, including China, the country's major ally, and Britain, which said the move was a "provocation".

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Ban Ki-moon: North Korea's nuclear test 'deeply troubling'

United Nations Secretary-General Ban Ki-moon Credit: PA

North Korea's nuclear test is "deeply troubling" and "profoundly destabilising for regional security", United Nations Secretary-General said.

Ban Ki-moon said: "This test once again violates numerous Security Council resolutions despite the united call by the international community to cease such activities.

He added it is a "grave contravention of the international norm against nuclear testing."

He demanded that North Korea cease any further nuclear activities and "meet its obligations for verifiable denuclearisation".

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