TO GO WITH STORY IRAN NUCLEAR -FILE- In this April 9, 2007, file photo, Iranian President Mahmoud Ahmadinejad speaks at a ceremony in Iran's nuclear enrichment facility in Natanz, south of capital Tehran, Iran. Technicians upgrading Iran’s main uranium enrichment facility have tripled partial or full installations of high-tech machines that could be used in a nuclear weapons program to more than 600 since starting their work three months ago, according to diplomats who demanded anonymity because they said they are not authorized to disclose the information, Wednesday April 17, 2013. (AP Photo/Hasan Sarbakhshian, File)

Associated Press
TO GO WITH STORY IRAN NUCLEAR  -FILE- In this April 9, 2007, file photo, Iranian President Mahmoud Ahmadinejad speaks at a ceremony in Iran's nuclear enrichment facility in Natanz, south of capital Tehran, Iran.  Technicians upgrading Iran’s main uranium enrichment facility have tripled partial or full installations of high-tech machines that could be used in a nuclear weapons program to more than 600 since starting their work three months ago, according to diplomats who demanded anonymity because they said they are not authorized to disclose the information, Wednesday April 17, 2013.   (AP Photo/Hasan Sarbakhshian, File)
TO GO WITH STORY IRAN NUCLEAR -FILE- In this April 9, 2007, file photo, Iranian President Mahmoud Ahmadinejad speaks at a ceremony in Iran's nuclear enrichment facility in Natanz, south of capital Tehran, Iran. Technicians upgrading Iran’s main uranium enrichment facility have tripled partial or full installations of high-tech machines that could be used in a nuclear weapons program to more than 600 since starting their work three months ago, according to diplomats who demanded anonymity because they said they are not authorized to disclose the information, Wednesday April 17, 2013. (AP Photo/Hasan Sarbakhshian, File)
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