Zia died in a plane crash on 17 August 1988. After witnessing a US M1 Abrams tank demonstration in Bahawalpur, Zia had left the small town in the Punjab province by C-130B Hercules aircraft. The aircraft departed from Bahawalpur Airport and was expected to reach Islamabad International Airport. Shortly after a smooth takeoff, the control tower lost contact with the aircraft. Witnesses who saw the plane in the air afterward claim it was flying erratically, then nosedived and exploded on impact. In addition to Zia, 31 others died in the plane crash, including chairman Joint Chiefs of Staff Committee General Akhtar Abdur Rahman, close associate of Zia, Brigadier Siddique Salik, the American Ambassador to Pakistan Arnold Lewis Raphel and General Herbert M. Wassom, the head of the US Military aid mission to Pakistan. Ghulam Ishaq Khan, the Senate chairman announced Zia's death on radio and TV. Conditions surrounding his death have given rise to many conspiracy theories. There is speculation that the United States, India, the Soviet Union (in retaliation for Pakistani support of the mujahideen in Afghanistan) or an alliance of them and internal groups within Zia's military were behind the incident.