An Italian air force transport plane crashed at a military airport in the western city of Pisa on Monday and burst into flames, killing at least four of the five-member crew, officials said.

Air force Col. Mauro Gabetta said the C-130 was on a training flight and had been approaching the airport when it suddenly veered away and then crashed. The cause of the crash was under investigation.

Four bodies were found, but the fate of the fifth crew member was not immediately known, military and fire officials said.