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US confirms N Korea nuclear test US confirms N Korea nuclear test
(20 minutes later)
Air samples from North Korea confirm that a nuclear explosion was carried out a week ago, US intelligence officials say.Air samples from North Korea confirm that a nuclear explosion was carried out a week ago, US intelligence officials say.
The Director of National Intelligence said the findings came after analysis of radioactive debris detected at the site of the test. Director of National Intelligence John Negroponte said the findings came after analysis of radioactive debris detected at the site of the test.
"The explosion yield was less than a kiloton," the US statement said. "The explosion yield was less than a kiloton," his statement said.
The UN Security Council has unanimously voted to impose sanctions against Pyongyang in response to the test.The UN Security Council has unanimously voted to impose sanctions against Pyongyang in response to the test.
The sanctions, agreed on Saturday after lengthy negotiations, target Pyongyang's weapons and missile programmes, as well as luxury goods.
The air samples were collected by a military aircraft on 11 October, two days after Pyongyang announced it had successfully carried out a test.
The size of the explosion - less than a 10th of the size of the bomb dropped on Hiroshima in 1945 - had led to doubts over the veracity of the claim.