During his time as Scotland's senior law officer, he was directly responsible for the conduct of the
investigation into the bombing of Pan Am Flight 103. Lord Fraser drew up the 1991
indictment against the two accused Libyans and issued warrants for their arrest. But five years after the
Pan Am Flight 103 bombing trial, when
Abdelbaset al-Megrahi was convicted of 270 counts of murder, he cast doubt upon the reliability of the main prosecution witness,
Tony Gauci. According to
The Sunday Times of 23 October 2005, Lord Fraser criticised the Maltese shopkeeper, who sold Megrahi the clothing that was used to pack the bomb suitcase, for
inter alia being "not quite the full shilling" and "an apple short of a picnic". Lord Advocate,
Colin Boyd, who was chief prosecutor at the Lockerbie trial, reacted by saying: "It was Lord Fraser who, as Lord Advocate, initiated the Lockerbie prosecution. At no stage, then or since, has he conveyed any reservation about any aspect of the prosecution to those who worked on the case, or to anyone in the prosecution service." Boyd asked Lord Fraser to clarify his apparent attack on Gauci by issuing a public statement of explanation.
William Taylor QC, who defended Megrahi at the trial and the appeal, said Lord Fraser should never have presented Gauci as a crown witness: "A man who has a public office, who is prosecuting in the criminal courts in Scotland, has got a duty to put forward evidence based upon people he considers to be reliable. He was prepared to advance Gauci as a witness of truth in terms of identification and, if he had these misgivings about him, they should have surfaced at the time. The fact that he is coming out many years later after my former client has been in prison for nearly four and a half years is nothing short of disgraceful. Gauci's evidence was absolutely central to the conviction and for Peter Fraser not to realise that is scandalous," Taylor said.
Tam Dalyell, former Labour MP who played a crucial role in organising the trial at
Camp Zeist in the Netherlands, described Lord Fraser's comments as an 'extraordinary development': "I think there is an obligation for the chairman and members of the
Scottish Criminal Cases Review Commission to ask Lord Fraser to see them and testify under oath – it's that serious. Fraser should have said this at the time and, if not then, he was under a moral obligation to do so before the trial at Zeist. I think there will be all sorts of consequences," Dalyell declared. ==Later career==