Ceremonies were held Sunday in the Scottish town of Lockerbie to mark the 20th anniversary of the bombing of Pan Am Flight 103, in which 270 people were killed. More than 150 people attended a wreath-laying ceremony Sunday at Lockerbie's Dryfesdale Cemetery, which has a memorial stone for those who died. Two churches in the area held services to coincide with the moment the plane came down, just after 1900GMT on Dec. 21 1988. Services were also held at Heathrow Airport in London and at Syracuse University in New York State. A total of 35 Syracuse students coming home after studying in London and Florence, Italy, were killed on board the flight. All 259 people on board the flight from Heathrow to New York were killed when a bomb exploded on the plane as it flew over Lockerbie. Another 11 people died on the ground. Libyan secret agent Abdel Basset Ali al-Megrahi is the sole person to have been convicted of the bombing, but he has won the right to appeal against his January 2001 conviction by successfully convincing judges that a "miscarriage of justice" may have occurred during his trial. -- wire services (15 images)
Mourners console each other during a memorial service for the 270 victims of the Lockerbie bombing on the 20th Anniversary of the terrorist attack on Pan Am Flight 103 on Dec. 21, 2008 in Lockerbie, Scotland. Services are also being held at Heathrow Airport and in the US. Getty Images / Jeff J Mitchell
A member of the public visits the Lockerbie memorial on Dec. 17, 2008 in Lockerbie, southern Scotland. A terrorist bomb caused Pan AM Flight 103 to crash almost 20 years ago on Dec. 21, 1988, with parts of the wing and fuel tanks landing in the town and killing 11 residents. The police investigation that followed into the air disaster, which also killed 259 passengers on the plane, was the biggest in Sottish history and subsequently became a murder inquiry when evidence found it was caused by a bomb. Getty Images / Jeff J Mitchell
Mourners weep during a memorial service for the 270 victims of the Lockerbie bombing on the 20th Anniversary of the terrorist attack on Pan Am Flight 103 on Dec. 21, 2008 in Lockerbie, Scotland. Services are also being held at Heathrow Airport and in the US. Getty Images / Jeff J Mitchell
Mourners gather to lay wreaths during a memorial service for the 270 victims of the Lockerbie bombing on the 20th Anniversary of the terrorist attack on Pan Am Flight 103 on Dec. 21, 2008 in Lockerbie, Scotland. Services are also being held at Heathrow Airport and in the US. Getty Images / Jeff J Mitchell
Members of Victims of Pan Am Flight 103, a group for people who lost their loved ones in the terrorist attack, leave flowers at the Pan Am 103 Memorial Cairn at Arlington National Cemetery Dec. 21, 2008 in Arlington, Virginia. Families and friends of the victims gathered to remember their lost loved ones and to mark the 20th anniversary of the attack by Libyan terrorists that brought down the flight over Lockerbie, Scotland on Dec. 21, 1988. Getty Images / Alex Wong
Mourners weep during a memorial service for the 270 victims of the Lockerbie bombing on the 20th Anniversary of the terrorist attack on Pan Am Flight 103 on Dec. 21, 2008 in Lockerbie, Scotland. Services are also being held at Heathrow Airport and in the US. Getty Images / Jeff J Mitchell
Part of the main memorial stone to the victims of the Pan Am flight 103 bombing in the garden of remembrance at Dryfesdale Cemetery, near Lockerbie, Scotland, Saturday Dec. 20, 2008. Pan Am flight 103 was blown apart above the Scottish border town of Lockerbie on Dec. 21, 1988. All 269 passengers and crew, on the Pan Am flight and 11 people on the ground were killed in the bombing. AP / Scott Heppell
Member Patricia J.S. Simpson, left, of Brooklyn, New York, of Victims of Pan Am Flight 103, a group for people who lost their loved ones in the terrorist attack, is comforted by her daughter Rachel Mercy Simpson during a memorial service at the Pan Am 103 Memorial Cairn at Arlington National Cemetery Dec. 21, 2008 in Arlington, Virginia. Families and friends of the victims gathered to remember their lost loved ones and to mark the 20th anniversary of the attack by Libyan terrorists that brought down the flight over Lockerbie, Scotland on Dec. 21, 1988. Getty Images / Alex Wong
A family member copies the name of a relative during a memorial service commemorating the 20th anniversary of Pam Am Flight 103 bombing over Lockerbie, Scotland at Arlington National Cemetery in Arlington, Va., Sunday, Dec. 21, 2008. AP / Luis M. Alvarez
The shadow of a member of the public looking at the main memorial stone in memory of the victims of the Pan Am flight 103 bombing is seen in the garden of remembrance at Dryfesdale Cemetery, near Lockerbie, Scotland, Saturday Dec. 20, 2008. Pan Am flight 103 was blown apart above the Scottish border town of Lockerbie on Dec. 21, 1988. All 269 passengers and crew, on the Pan Am flight and 11 people on the ground were killed in the bombing. AP / Scott Heppell
A bouquet of flowers is seen on the ground during a memorial service at the Pan Am 103 Memorial Cairn at the Arlington National Cemetery Dec. 21, 2008 in Arlington, Virginia. Families and friends of the victims gathered to remember their lost loved ones and to mark the 20th anniversary of the attack by Libyan terrorists that brought down the flight over Lockerbie, Scotland on Dec. 21, 1988. Getty Images / Alex Wong
Local resident Susan Neal stands in front of a stained glass window in Lockerbie Town Hall, Lockerbie, Scotland, Sunday, Dec. 21, 2008, depicting the flags of all the Nations which lost citizens in the Lockerbie disaster when Pan Am flight 103 was blown apart above the Scottish border town on Dec. 21, 1988. All 269 passengers and crew, on the Pan Am flight and 11 people on the ground were killed in the bombing. AP / Danny Lawson
Part of the wreckage of the Boeing 747 that was Pan Am Flight 103 which exploded over Lockerbie, Scotland, on Dec. 21, 1988, with the loss of 270 lives, lies in the corner of a salvage yard near Tattershall, England, Wednesday Dec. 17, 2008. A dying Libyan secret agent is in prison, the sole person convicted of the crime, but he has earned a second appeal by convincing judges that "a miscarriage of justice" may have occurred during his 2002 trial. Some of the families of the victims, particularly those on the British side of the Atlantic, are still not convinced that Abdel Basset Ali al-Megrahi, 56, is to blame for the bombing, which killed 259 people, mostly Americans, in the air, and 11 more on the ground. Al-Megrai is serving a life sentence for the mass killings. AP / Anna Gowthorpe-pa
File Photo -- The reconstructed remains of Pan Am flight 103 lie in a warehouse on January 15, 2008 in Farnborough, England. The Air Accident Investigation Branch have housed the remains of the Boeing 747 for the past 19 years. It is 20 years ago on Dec. 21, 2008 since a terrorist bomb exploded on-board destroying the aircraft over the Scottish town of Lockerbie killing 270 people including 11 on the ground. Getty Images / Peter Macdiarmid
An unidentified woman holds a lit candle at Tundergarth Church, near Lockerbie in Scotland, as ceremonies were held Sunday Dec. 21 2008 to mark
the 20th anniversary of the bombing of Pan Am Flight 103, in which 270 people were killed. More than 150 people attended a wreath-laying ceremony Sunday at Lockerbie's Dryfesdale Cemetery, which has a memorial stone for those who died. Two churches in the area held services to coincide with the moment the plane came down, just after 1900GMT on Dec. 21 1988. AP / The Times / James Glossop
