FILE - In this July 7, 1988 file photo, mourners carry coffins through the streets of Tehran, Iran, during a mass funeral for the victims aboard Iran Air Flight 655, which was shot down by the USS Vincennes in the Persian Gulf. The Western allegation that Iran shot down a Ukrainian jetliner and killed 176 people offers a grim echo for the Islamic Republic, which found itself the victim of an accidental shootdown by American forces over 30 years ago. (AP Photo/Canadian Press, File)