Scotland's Crown Office says there is 'nothing new' in the latest claims that Iran was responsible for the Lockerbie air disaster.
"Mesbahi's claim that Iran was responsible was first reported in the media in the late 1990s and was available to the defence before the trial but they did not call him as a witness.
"The only appropriate forum for the determination of guilt or innocence is the criminal court, and Mr Megrahi was convicted unanimously by three senior judges. His conviction was upheld unanimously by five judges, in an Appeal Court presided over by the Lord Justice General, Scotland’s most senior judge.
"As the investigation remains live, it would not be appropriate to offer further comment."
The Lockerbie bombing was ordered by Iran in retaliation for a US strike on an Iranian passenger plane, a new documentary has claimed.
Libyan Abdelbaset al-Megrahi was convicted of the bombing of Pan Am flight 103 over Scotland in which 270 people were killed more than 25 years ago.
But former Iranian intelligence officer Abolghassem Mesbahi has told an Al Jazeera documentary that the bombing was ordered by Tehran. He says it was carried out by the Syrian-based Popular Front for the Liberation of Palestine-General Command.
It's claimed it was in retaliation for a US navy strike on an Iranian commercial jet six months earlier, in which 290 people died.The US ship apparently mistook the plane for an F-14 fighter jet.
"Iran decided to retaliate as soon as possible. The decision was made by the whole system in Iran and confirmed by Ayatollah Khomeini.
The target of the Iranian decision makers was to copy exactly what's happened to the Iranian Airbus. Everything exactly same, minimum 290 people dead. This was the target of the Iranian decision makers."
– Abolghassem Mesbahi, former Iranian Intelligence Officer
Lord Fraser dedicated his life to public service and enjoyed a remarkable career, from the Lockerbie investigation to the inquiry into the parliament. He was a popular figure across the political divide and I know he will be greatly missed."
Lady Fiona says the family are "completed devastated by Peter's sudden and unexpected death"
On Friday we were making arrangements and filling our diaries with plans for holidays, the Open golf championship, visits to family and friends and the Christening of our latest granddaughter Delphin and the next morning he was gone."
– Lady Fiona, wife of Lord Fraser of Carmyllie
A funeral service for Lord Fraser's extended family is being organised with a public thanksgiving service to be arranged in a few weeks.
Lord Fraser leaves an outstanding record of public service to Scotland as a politician and, particularly, as Lord Advocate. Scottish public life is much poorer for his passing and my thoughts are with his wife, Fiona, and their family at this sad time."
Tributes are being paid to Lord Fraser of Carmyllie who has died suddenly aged 68. He was the former Lord Advocate who led the investigation into the Lockerbie bombing. The Conservative peer also served as an MP for East Angus and South Angus.
Scottish Conservative leader Ruth Davidson said "Peter brought a formidable intellect to both Parliament and Government. A hugely engaging figure, he was passionate about both history and the law. My thoughts and prayers go to his wife, Fiona, and to their family.”