** FILE ** In this Wednesday Feb. 15, 2012, file photo, released by the Iranian President's Office, claims to show Iranian President Mahmoud Ahmadinejad, second left being escorted by technicians during a tour of Tehran's research reactor center in northern Tehran, Iran. (AP Photo/Iranian President's Office, File)

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** FILE ** In this Wednesday Feb. 15, 2012, file photo, released by the Iranian President's Office, claims to show Iranian President Mahmoud Ahmadinejad, second left being escorted by technicians during a tour of Tehran's research reactor center in northern Tehran, Iran. (AP Photo/Iranian President's Office, File)