UN atomic agency chief says he cannot conclude that all Iranian nuclear programs are peaceful

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Iran is reducing its nuclear activities under a deal with six world powers, but a senior U.N. official says he cannot guarantee that everything it is doing is peaceful.

International Atomic Energy Agency chief Yukiya Amano spoke Thursday to the IAEA's 35-nation board.

Amano says he is "not in a position to provide credible assurance about the absence of undeclared nuclear material and activities in Iran," and thus cannot conclude that "all nuclear material in Iran is in peaceful activities."

His comments reflect IAEA constraints on monitoring Iran. But Amano said Tehran will soon enact an agreement giving his agency greater inspection powers

Iran says it does not want nuclear arms but has committed to nuclear program cuts under a deal, in return for the removal of crippling economic sanctions.