Lockerbie bombing

Rescue workers examine the nose of Pan Am Flight 103 near the town of Lockerbie, Scotland, after a bomb aboard exploded and killed 270 people on Dec. 21, 1988. (Martin Cleaver / Associated Press)

March 25, 2014 1:11 AM PT

The explosion of Pan Am Flight 103 left burned-out houses and a huge crater near Lockerbie, Scotland, in December 1988. (Martin Cleaver / Associated Press)

Soldiers search the crater left after the crash of Pan Am Flight 103 near the town of Lockerbie, Scotland, on Dec. 21, 1988. (Martin Cleaver / Associated Press)

A police officer walks by the nose of Pan Am Flight 103 in a field near the town of Lockerbie, Scotland, on Dec. 21, 1988. (Martin Cleaver / Associated Press)

Grieving participants listen to names of victims of Pan Am Flight 103 read at the Lockerbie Memorial on Nov. 3, 1995, at Arlington National Cemetery. (Denis Paquin / Associated Press)

Convicted Lockerbie bomber Abdel Basset Ali Megrahi, center, is escorted by security officers in Tripoli in 1992. (Manoocher Deghati / AFP/Getty Images)

Susan Cohen of Cape May Court House, N.J., is comforted by her husband, Dan, as she breaks down after leaving the Scottish Court at the end of the first day of the trial against two Libyans at Camp Zeist, Netherlands, in 2000. (Peter Dejong / Associated Press)

Convicted Lockerbie Pan Am airline bomber Abdel Basset Ali Megrahi, in wheelchair, is visited by a delegation of African parliamentarians at Tripoli Central Hospital in Libya. Megrahi died in 2009. (Sabri Elmhedwi / EPA)

In this image taken from a newscast on Libya’s official television, Libyan leader Moammar Kadafi meets with freed Lockerbie bomber Abdel Basset Ali Megrahi in Tripoli in 2009. (AFP/Getty Images)

A person’s shadow in 2001 falls on a memorial for those who died in the bombing of Pam Am Flight 103 in Lockerbie, Scotland, in 1988. (Alastair Grant / Associated Press)