UN vows new measures against North Korea

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UNITED NATIONS: The UN Security Council said on Wednesday it would begin working immediately on significant new measures in response to North Korea´s fourth nuclear test, a threat diplomats said could mean an expansion of UN sanctions against Pyongyang.

North Korea said it successfully tested a miniaturized hydrogen nuclear bomb on Wednesday.

Atomic weapons experts cast doubt on the isolated nation´s ability to make such an advance, but the test rang international alarm bells.