Perhaps more significantly, officials say there are indications of increased activity at a site used to fire long-range missiles.
The officials spoke on condition of anonymity because methods of gathering information about North Korea are sensitive. The officials also say an initial U.S. air sampling from near the underground test site was inconclusive.
Officials say that first test doesn't prove the North successfully completed an atomic reaction. At least one more test is coming.
(Copyright 2009 by The Associated Press. All Rights Reserved.)
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