Pan Am flight 103, also called Lockerbie bombing, flight of a passenger airliner operated by Pan American World Airways (Pan Am) that exploded over Lockerbie, Scotland, on December 21, 1988, after a bomb was detonated. All 259 people on board were killed, and 11 individuals on the ground also died.

Pan Am flight 103 A section of the cockpit of Pan Am flight 103, after it was destroyed by a bomb over Lockerbie, Scotland, in December 1988. Air Accidents Investigation Branch, United Kingdom/Contains public sector information licensed under the Open Government Licence v3.0

Britannica Quiz History Lesson: Fact or Fiction? Aluminum was once more valuable than gold.

About 7:00 pm on December 21, Pan Am flight 103, a Boeing 747 en route to New York City from London, exploded over Lockerbie, Scotland. The plane had reached a height of approximately 31,000 feet (9,500 metres) and was preparing for the oceanic portion of the flight when a timer-activated bomb detonated. The bomb, constructed with the odourless plastic explosive Semtex, was hidden in a cassette player that was stored in a suitcase. The blast broke the plane into thousands of pieces that landed in an area covering roughly 850 square miles (2,200 square km). All 259 passengers and crew members were killed. Falling wreckage destroyed 21 houses and killed an additional 11 people on the ground.

Although the passengers aboard the plane came from 21 countries, the majority of them were Americans, and the attack increased terrorism fears in the United States. Investigators believed that two Libyan intelligence agents were responsible for the bombing; many speculated that the attack had been retaliation for a 1986 U.S. bombing campaign against Libya’s capital city, Tripoli. Libyan leader Muammar al-Qaddafi refused to turn over the two suspects. As a result, the United States and the United Nations Security Council imposed economic sanctions against Libya. In 1998 Qaddafi finally accepted a proposal to extradite the men. In 2001, after an investigation that involved interviewing 15,000 people and examining 180,000 pieces of evidence, Abdelbaset Ali Mohmed al-Megrahi was convicted of the bombing and sentenced to 20 (later 27) years in prison. The other man, Lamin Khalifa Fhimah, was acquitted. The Libyan government eventually agreed to pay damages to the families of the victims of the attack.

In 2009 Megrahi, who had been diagnosed with terminal cancer, was released from prison in Scotland on compassionate grounds and allowed to return to Libya; the United States strongly disagreed with the Scottish government’s decision. In July 2010 an investigation spurred by U.S. senators revealed that oil company BP had lobbied for a prisoner transfer agreement between the United Kingdom and Libya. Although both BP and the U.K. government denied that Megrahi was discussed specifically, in 2009 British justice minister Jack Straw had stated that BP’s business dealings with the Libyan government were a factor in considering his case.