Fresh activity seen at North Korea nuclear site: U.S. think tank

A U.S. research institute said on Friday it had seen fresh activity in satellite images of North Korea's main nuclear complex, suggesting that reprocessing may be underway to produce more plutonium for atomic bombs. A report this month on the 38 North website run by the Johns Hopkins University's School of Advanced International Studies said exhaust plumes had been detected from the thermal plant at Yongbyon's Radiochemical Laboratory, the site's main reprocessing installation to produce plutoni