The 1976 Tehran UFO Incident was a radar and visual sighting of an unidentified flying object (UFO) over Tehran, the capital of Iran, during the early morning hours of September 19, 1976. The incident is particularly notable for the electromagnetic interference effects observed on aircraft in close proximity to the object: two F-4 Phantom II jet interceptors independently lost instrumentation and communications as they approached, only to have them restored upon withdrawal, and one of the aircraft also suffered temporary weapons systems failure while preparing to open fire. The incident is well-documented in an U.S. Defense Intelligence Agency (DIA) report with a distribution list that included the White House, Secretary of State, Joint Chiefs of Staff, National Security Agency (NSA), and Central Intelligence Agency (CIA). Various high-ranking Iranian military officers directly involved with the events have also gone on public record stating their belief that the object was not terrestrial in origin.