Forty years ago, Ayatollah Ruhollah Khomeini spearheaded an Islamic Revolution that deposed Iran's shah. The country's authoritarian monarchy was replaced by a repressive theocracy, and almost overnight, Iran was transformed from a crucial U.S. ally to bitter foe.
In Pictures: Iran's 1979 Islamic Revolution
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An Iranian army tank and soldiers on a road leading to Tehran's airport. The army prevented an Iranian Airlines jet from taking off for Paris to pick up exiled Islamic leader Ayatollah Khomeini for his return to Iran.
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Days after the Shah's departure, hundreds of people, including many foreigners, were desperate to leave Iran. People packed into the departure hall of Tehran's Mehrabad Airport on January 25, 1979, with the hopes of catching a flight out of the country.
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Severe clashes erupt on January 26, 1979 amid Iran's political instability and leadership vacuum. Antigovernment demonstrators dive for cover as Iranian army soldiers fire live rounds in Tehran.
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Ayatollah Ruhollah Khomeini leaves his villa in Neauphle-le-Chateau, near Paris, on January 31, 1979, to board an Air France jet bound for Tehran.