The Khobar Towers bombing was a terrorist attack on part of a housing complex in the city of Khobar, Saudi Arabia, near the national oil company (Saudi Aramco) headquarters of Dhahran and nearby King Abdulaziz Air Base on 25 June 1996. At that time, Khobar Towers was being used as living quarters for coalition forces who were assigned to Operation Southern Watch, a no-fly zone operation in southern Iraq, as part of the Iraqi no-fly zones.
A truck bomb was detonated adjacent to Building #131, an eight-story structure housing members of the United States Air Force's 4404th Wing (Provisional), primarily from a deployed rescue squadron and deployed fighter squadron. In all, 19 U.S. Air Force personnel were killed and 498 of many nationalities were wounded. The official 25 June 1996, statement by the United States named members of Hezbollah Al-Hejaz () as responsible. In 2006, a U.S. court found Iran and Hezbollah guilty of orchestrating the attack. In July 2020, a US court ordered Iran to pay $879m to the Khobar bombing survivors.
The attack
On 13 November 1995, a car bombing in Riyadh outside the headquarters of the OPM-SANG killed six Americans and two Indian citizens and injured about 70 others. This attack led the U.S. forces stationed at Khobar Towers to raise the threat condition to THREATCON DELTA. Days after this car bombing, military commanders briefed soldiers and airmen at Khobar that the U.S. had received anonymous communications from an organization claiming to have carried out the Riyadh attack. The attackers claimed their goal was to get the United States Armed Forces to leave the country, and that Khobar Towers would be attacked next if troop withdrawal did not begin immediately. It was at this time that surveillance and other suspicious activity near the perimeter fences of Khobar Towers was noted by United States Air Force Security Forces; however, the forces were forbidden by the Saudi government to act in any capacity outside the perimeter of the compound, and the surveillance continued with near impunity.
The attackers were reported to have smuggled explosives into Saudi Arabia from Lebanon. Al-Mughassil, Al-Houri, Al-Sayegh, Al-Qassab, and the unidentified Lebanese man bought a large latrine service tanker truck in early June 1996 in Saudi Arabia. Over a two-week period they converted it into a truck bomb. The group now had about of plastic explosives, enough to produce a shaped charge that detonated with the force of at least of TNT, according to a later assessment of the Defense Special Weapons Agency. The power of the blast was magnified several ways. The truck itself shaped the charge by directing the blast toward the building. Moreover, the relatively high clearance between the truck and the ground gave it the more lethal characteristics of an air burst.
It was originally estimated by U.S. authorities to have contained of explosives. Later the General Downing report on the incident suggested that the explosion contained the equivalent of of TNT. The attackers prepared for the attack by hiding large amounts of explosive materials and timing devices in paint cans and bags underground in Qatif, a city near Khobar. The bomb was a mixture of petrol and explosive powder placed in the tank of a sewage tanker truck.
Initially, the attackers attempted to enter the compound at the main checkpoint. When they were denied access by U.S. military personnel, at around 9:43 p.m. local time, they drove a Datsun scout vehicle, another car and the bomb truck, to a parking lot adjacent to building #131. A chain link security fence and a line of small trees separated the car park, used for a local mosque and park, from the housing compound. The perimeter of Building #131 was approximately from the fence line, with a perimeter road between the fence and building which was often used by military personnel for jogging. The first car entered the car park and signaled the others by flashing headlights. The bomb truck and a getaway vehicle followed shortly after. The men parked the truck next to the fence and left in the third vehicle. The bomb exploded three to four minutes later at approximately 10:20 p.m. local time. The blast was so powerful that it was felt away in the Persian Gulf state of Bahrain.