Megrahi, who was given a life sentence in 2001 for 270 counts of murder, is said to be in the final stages of prostate cancer.
Enroute from London's Heathrow Airport to JFK Airport, Pan Am Flight 103 was destroyed while flying over Lockerbie, Scotland, killing all 243 passengers and 16 crew members. Eleven more people on the ground were killed by falling debris, bringing the total death toll to 270. The majority of the victims were Americans, with 40 British citizens also killed.
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Images from the 1988 bombing:
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