In this April 10, 2021, file photo released by the official website of the office of the Iranian presidency, Iranian President Hassan Rouhani, second from right, listens to the head of the Atomic Energy Organization of Iran Ali Akbar Salehi while visiting an exhibition of Iran's new nuclear achievements in Tehran, Iran. Iran's nuclear program has been targeted by diplomatic efforts and sabotage attacks over the last decade, with the latest incident striking its underground Natanz facility. The attack Sunday, April 11, 2021 at Natanz comes as world powers try to negotiate a return by Iran and the U.S. to Tehran's atomic accord. (Iranian Presidency Office via AP) **FILE**
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