A board of inquiry was set up to investigate the crash. It concluded 'the most probable cause of the crash was a criminal act of sabotage perpetrated in the aircraft'. It also suggested that poisonous gases were released which incapacitated the passengers and crew, which would explain why no Mayday signal was given. There was also speculation into other facts involving the details of the investigation. A flight recorder (black box) was not located after the crash even though previous C-130 aircraft did have them installed.