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U.S. Worried by Possible Korean Nuclear Test

U.S. officials closely monitor what they call worrisome new data on North Korea's nuclear activities after a large unexplained explosion was reported over North Korea Thursday. Experts seek to determine whether North Korea is preparing to test a nuclear weapon. NPR's Vicky O'Hara reports.

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Vicky O'Hara
Victoria (Vicky) O'Hara is a diplomatic correspondent for NPR. Her coverage of the State Department and foreign policy issues can be heard on the award-winning Morning Edition, All Things Considered, and Weekend Edition as well as on NPR's newscasts.