On February 11 the radio announced the victory : "This is the voice of Islamic revolution of Iran". The Pahlavi dynasty was officialy overthrown and the CIA were shocked.
Cyrus Vance, US foreign minister during the formation and victory of Islamic revolution, mentions the reasons of the fall of Pahlavi dynasty in his diaries: "In my opinion, the fall of Shah was the cross section of conflict between the western modernization and social, economic and religous structures.