The collection of evidence from Britain's worst act of terrorism began immediately - and within a week detectives announced it had been caused by a bomb in a radio cassette player.
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Dr Jim Swire, whose daughter Flora was one of the victims of the atrocity, said a break-in [at Heathrow Airport] the night before near the Pan Am secure baggage area was not fully investigated by police, who he claims concealed the evidence. "I wrote recently to the Crown Office (which handles Scottish prosecutions) asking why that had been concealed for 12 years, and if they knew about it all along," he said. He said they would not answer his question, which he said meant there must now be a thorough inquiry into the incident. During Megrahi's first appeal, held at Kamp van Zeist in the Netherlands, his counsel raised the matter, saying it cast doubt on claims that the fatal bomb must have been loaded in Malta. But the five appeal judges rejected the suggestion.
Malta had become crucial once police found a fragment of the bomb timer wrapped in a piece of clothing in a Dumfriesshire forest. The clothes had Maltese labels - but question marks remain about how this discovery was made several months after the disaster, and also over how the material was handled. The original trial heard labels on police evidence bags containing the fragment had been changed: the evidence of the officer who had done this was heavily criticised by the trial judges.
There were question marks too over Tony Gauci, a Maltese shopkeeper who was the only man to identify Megrahi. His evidence was that the Libyan, who he picked out at an identity parade, had bought the clothes at his shop. But his police statements are inconsistent, and prosecutors failed to tell the defence that shortly before he attended an identity parade, Mr Gauci had seen a magazine article showing a picture of Megrahi, and speculating he might have been involved. Mr Gauci now lives in Australia, and is believed to have been paid several million dollars by the Americans for his evidence.
Secret documents before the Appeal Court - which even the defence has not seen - might have provided new information. They will now remain undisclosed, after the foreign secretary issued a Public Information Immunity certificate stating that to publish them would be to the detriment of UK national security.
Abdelbaset Ali al-Megrahi is now dying, but he may have been a convenient scapegoat for a much bigger conspiracy.
http://news.bbc.co.uk/1/hi/scotland/8211596.stm