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By , The International Atomic Energy Agency on Tuesday closed its investigation into Iran’s past nuclear weapons activities, clearing the way for implementation of the nuclear deal signed with global powers last summer. The IAEA board of governors unanimously approved a report issued by the agency’s director general two weeks ago that concluded that although Iran conducted some uncoordinated research until 2009, it had ended its active program to develop a nuclear weapon in 2003. The report, and the board’s acceptance of it, is part of the agreement under which nuclear-related international sanctions against Iran will be lifted in exchange for Iran’s dismantlement of most of its nuclear infrastructure and ongoing verification that its program is limited to energy purposes. IAEA Director General Yukiya Amano told the board that he will inform them “promptly” once the preparatory steps agreed to in the deal have been completed and implementation can begin. That could be as early as next month, although some experts think it will take Iran months to complete the promised dismantlement of centrifuges and other steps it has agreed to take. Amano also warned the board that the agency will need significant additional money to verify that Iran is complying with the accord in the future. “Much work lies ahead of us,” Amano said. “Considerable effort was required in order to reach this agreement. A similar and sustained effort will be required to implement it.” Senate Foreign Relations Committee Chairman Bob Corker (R-Tenn.) expressed “disappointment”…