"The only person ever convicted for the bombing of Pan Am Flight
 103 over Lockerbie, Scotland was Libyan. And although the former Libyan
 dictator, Muammar Qaddafi, never accepted personal blame for the 
attack, in 2003 his government took responsibility 
“for the actions of its officials” and agreed to pay $2.7 billion in compensation to families of the bombing’s 270 victims. But the case against Libya has never been universally accepted. 
Nearly 30 years since the attack, some victims’ family members, 
journalists, and investigators dispute the prosecution’s version of 
events. Among those who have found fault with the case include a United 
Nations observer to the Lockerbie trial, the trial’s legal architect and
 an independent review commission established by the Scottish 
government. Over the years, alternative theories have proliferated, as have books
 and documentaries that purport to present the “real story” of what was 
one of the worst terrorist attacks against Americans before 9/11. Two men were originally indicted for the Lockerbie attack: 
Abdel Basset al Megrahi, who was convicted in 2001, and a second Libyan, 
Lhamen Fhimah,
 who was acquitted. Over the course of their months-long trial, 
prosecutors alleged that Megrahi, a man U.S. investigators identified as
 a member of Libyan intelligence, and Fhimah, a station manager for 
Libyan Arab Airlines, were responsible for getting the suitcase believed
 to have carried the bomb onto Flight 103. The bomb was built into a 
Toshiba cassette recorder, and tucked inside a brown Samsonite 
suitcase with clothes that Megrahi was said to have purchased. The court accepted the prosecution’s arguments against Megrahi and sentenced him to life in prison, but it acquitted Fhimah, 
stating
 that there was “insufficient corroboration” of the evidence against 
him. This outcome was emphatically criticized by the United Nations 
observer to Megrahi’s trial, Hans Kochler, who in 2001 stated in his 
official 
report
 that the court’s decision was “exclusively based on circumstantial 
evidence and on a series of highly problematic inferences,” and that the
 guilty verdict “appears to be arbitrary, even irrational.” The outcome was similarly decried by the man credited with creating 
the unique legal framework of the trial — a non-jury trial under Scots 
Law held in the neutral country of Netherlands — Edinburgh University 
emeritus law professor Robert Black. He has spent years 
blogging
 about his disagreement with Megrahi’s conviction, which he says was 
unwarranted considering the evidence, and would not have been replicated
 in a jury trial. In 2007, the Scottish Criminal Cases Review Commission, after more 
than three years of investigating, validated several of these 
misgivings, 
concluding that
 “some of what we have discovered may imply innocence” and referred 
Megrahi’s case to an appeal court in the interests of avoiding “a 
miscarriage of justice.” The commission rejected several points of contention raised by 
critics, saying they found no signs that evidence had been tampered 
with, that the Libyans had been framed, or that there had been 
“unofficial CIA involvement” in the investigation. But other points were
 worrying enough that the case merited an appeal. One point of concern for the commission involved a key witness for 
the prosecution — a shopkeeper from Malta named Tony Gauci, who 
testified that Megrahi had purchased the clothes that accompanied the 
bomb from his shop. However, the commission found Gauci’s testimony problematic. He said 
it was raining the day Megrahi went shopping, but weather reports show 
it was likely not raining when Megrahi was in Malta. And Gauci said that
 Christmas lights on his streets were not yet on, when there is evidence
 that they were. Gauci also identified Megrahi from a lineup as the man who came into 
his shop — but only after being shown a picture of him in a magazine. 
The commission said this detail “undermines the reliability of his 
identification” of Megrahi. Megrahi’s defenders say there is still more to consider. In an 
interview with FRONTLINE filmmaker Ken Dornstein, John Ashton, who 
worked as a defense investigator during Megrahi’s first appeal and has 
written three books arguing that Megrahi was innocent, said 
the origin of the timer used in the bomb is questionable. According to 
metallurgists hired by the defense in 2009, the timer’s circuit board 
was a different color and coated in a different substance than those 
designed by MEBO, the Swiss company that the timer was linked back to 
and that had a relationship with the Libyans. This discrepancy “breaks 
the link with those timers, breaks the link with Libya, breaks the link 
with Megrahi,” said Ashton. Ashton has also dismissed the prosecution’s allegation that the 
suitcase originated from Malta and travelled through Frankfurt, 
writing in a recent 
opinion piece
 that a researcher “has effectively proved that the bomb originated from
 Heathrow.” This theory hangs on evidence of a security breach at 
Heathrow Airport in London — where Pan Am Flight 103 originated — 18 
hours prior to the attack. However, an appeals panel 
rejected this argument as grounds for a retrial. Many of these points have never seen their day in court, because 
Megrahi abandoned his second appeal right before he was released from 
Scottish prison in 2009 on compassionate grounds due to ill health. “The appeal, had it gone forward, would have dragged the Scottish 
criminal justice through the mud,” Ashton said. “I believe they wanted 
this buried.”... Today, nearly 30 years after the attack, many such questions around 
Lockerbie have yet to be definitively answered. For some at least, that 
means the bombing will remain a mystery.
       
http://www.pbs.org/wgbh/pages/frontline/foreign-affairs-defense/my-brothers-bomber/lockerbie-the-alternate-theories/