Suspicions that North Korea has begun to extract plutonium for making nuclear bombs have been heightened by US claims that it has detected a tell-tale radioactive gas.
But speculation that the country may have secretly built a second plutonium plant is being treated with caution by experts. "Recent experience suggests we should reserve judgement until we get proof," says Jon Wolfsthal, a former US weapons inspector in North Korea.
Yahoo News
Full Version: Krypton clue to North Korean nuclear progress
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Nuclear weopans give me the willys 
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