Pictures and equipment of Americans are seen inside the former U.S. embassy in downtown Tehran, Iran, March 10, 2013. The United States broke off diplomatic relations with Iran on April 7, 1980 after a group of Iranian students seized the U.S. embassy in Tehran and captured some 60 U.S. diplomats in 1979, with 52 of them being in captivity for 444 days in the hostage crisis. <Xinhua/Ahmad Halabisaz>
