An Iranian-American journalist who worked for a U.S.-funded broadcaster is believed to have been detained by Iran for months, according to State Department officials. Reza Valizadeh, who worked for Radio Farda, was imprisoned by the Iranian regime. Valizadeh's detainment comes as Iran celebrates the 45th anniversary of the American Embassy takeover and hostage crisis. Supreme Leader Ayatollah Ali Khamenei has been threatening both the U.S. and Israel with a 'crushing response' amid rising tensions.