FILE - Ayatollah Khomeini speaks to followers at Behesht Zahra Cemetery after his arrival in Tehran, Iran, ending 14 years of exile, Feb. 1, 1979. The Islamic Revolution brought Khomeini to power and students seized the U.S. Embassy in Tehran, beginning the 444-day hostage crisis. Iran’s atomic program first came to the country under American aspirations of peaceful energy but later found itself the target of Western fears over the Islamic Republic’s intentions. (AP Photo/FY)