A U.S.-made F-5 fighter jet in the Iranian air force crashed Wednesday during a training flight in southwest Iran, killing its pilot, the state news agency reported, according to AP. The crash took place Wednesday morning outside the city of Dezfull, 500 kilometers (300 miles) southwest of Tehran, said the region's governor, Hamid Qana'ati. «It was a training flight but reason of crash is not clear» and is under investigation, Qana'ati was quoted as saying by the state-run IRNA news agency.