Iranian demonstrators protest outside the U.S. Embassy with a poster portraying Uncle Sam as a warmonger and a portrait of the Ayatollah Khomeini in this November 28, 1979 file photo. The twentieth anniversary of the takeover of the U.S. Embassy by militant Iranian students was marked Thursday, Nov. 4, 1999, by a rally of 10,000 students burning American flags and chanting ``Death to America! Death to Israel!'' In 1979, the militants seized 52 Americans and held them hostage for 444 days. (AP Photo)