Leading American scientists Friday warned against Western complacency over Iran's nuclear drive, saying in a study that Tehran last year boosted its capacity to build an atomic bomb. The study, published by a body set by scientists from the top-secret Manhattan Project which built the world's first atomic bomb, comes as the United States and five other powers hold nuclear talks with Iran in Istanbul.
And it follows claims by US and Israeli officials that international efforts have slowed Iran's nuclear drive. The Washington-based Federation of American Scientists said on its website that the gas centrifuges at Iran's main enrichment plant in Natanz became more efficient in 2010.
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