The 270 people who lost their lives in the Lockerbie bombing exactly 26 years ago will be remembered at a memorial service in the United States today.
Scottish law officers will be among those attending the service at the Arlington cemetery in Washington to mark the anniversary of the 1988 atrocity.
Leading the delegation will be Scotland's top prosecutor, Lord Advocate Frank Mulholland.
He has reaffirmed his belief in the guilt of the only man convicted of the bombing, Abdelbaset al-Megrahi, and vowed to track down his accomplices.
The father of one of the victims of the Lockerbie bombing has hit out at comments from Scotland's leading prosecutor that suggested there were no problems with the conviction of Abdelbaset al-Megrahi.
Jim Swire, whose 23-year-old daughter Flora died in the attack, has campaigned for the case to be re-examined, claiming there is evidence that Megrahi was not responsible.
Dr Swire told Sky News:
For the Lord Advocate to say there isn't a shred of evidence to suggest that the trial was anything other than what it should have been is analogous with the late Mandy Rice-Davies when she says 'he would say that, wouldn't he'.
Twenty six years ago is a long time and I suppose he means people currently in his Crown Office don't believe there is anything wrong with the evidence. But I think if you open your eyes and look you cannot fail to see that there is a problem.
More importantly than that, Scotland's own Criminal Cases Review Commission years ago found six reasons why this case should be revisited and reviewed. So for the Lord Advocate now to say there isn't a shred of evidence flies in the face of what the Scottish Criminal Cases Review Commission actually told the world years ago.
Former Liberal Democrat leader Sir Menzies Campbell has condemned the "repeated and unfounded criticism" of judges who presided over the Lockerbie bombing trial of Abdelbaset al-Megrahi.
Abdelbaset al-Megrahi was found guilty of the killing of 270 people after the Pan Am flight exploded at 31,000ft on 21 December 1988.
Sir Menzies said the judges had "unquestioned integrity".
One of the most unsavoury elements of this case is the repeated and unfounded criticism of the judges who sat in the trial, and those who heard the subsequent appeal against conviction.
The judges by convention are unable to respond publicly to these criticisms, which imply that they were somehow part of a conspiracy.
In truth, they were all experienced in criminal law and of unquestioned integrity.
It is a curious feature of this case that those who argued most vehemently for a special court to be set up to deal with the case are now among the most vociferous critics of its verdict.
Scotland's top prosecutor has reaffirmed Abdelbaset al-Megrahi's guilt in the killing of 270 people in the Lockerbie bombing and has pledged to track down his accomplices.
Lord Advocate Frank Mulholland said no Crown Office investigator or prosecutor had raised a concern about the evidence in the bombing of Pan Am flight 103 in 1989.
Megrahi's part in the bombing has been called into question in a series of books, documentaries and testimony to the Scottish Parliament.
A petition seeking "Justice For Megrahi", backed by politicians and family members of some victims, remains on Holyrood's books two years after al-Megrahi's death.
But in an address to relatives on the anniversary of the bombing, Mr Mulholland said his investigation "remains on the evidence, and not on speculation and supposition".
The family of Abdelbaset al-Megrahi, along with 24 relatives of Lockerbie bombing victims, have today launched a posthumous appeal against the Libyan's convictions.
It marks the latest step in a protracted legal battle since Megrahi's conviction at a special court in the Netherlands in 2001.
- May 2000: Megrahi and another Libyan, Al Amin Khalifa Fahima, begin trial at a special Scottish court sitting in the Netherlands.
- January 2001: Megrahi convicted of murdering 270 people, Fahima is acquitted.
- January 2002: First appeal, heard in front of five judges, is unsuccessful - Megrahi begins a life sentence in a Glasgow prison.
- June 2007: Scottish Criminal Case Review Commission (SCRCC) sends case to the High Court for appeal, saying Megrahi "may have suffered a miscarriage of justice".
- August 2009: Megrahi released from prison on compassionate grounds after doctors say he will die from cancer within months.
- May 2012: Megrahi dies at home in Tripoli.
- June 2014: Megrahi's family and relatives of victim announce a new appeal is being sent to the SCCRC.
Lawyers appealing the conviction of Abdelbaset al-Megrahi for the Lockerbie bombing say they have evidence the Libyan was put under pressure not to pursue an earlier appeal.
Mr Megrahi was released from a Scottish prison on compassionate grounds in 2009, before dying at home in Libya in 2012.
Law firm Aamer Anwar & Co say Mr Megrahi was pressurised into "dropping his appeal as a condition of his immediate release" - a claim both the British and Scottish governments have denied.
A lawyer representing relatives of Abdelbaset al-Megrahi said he is sending three volumes of papers as part of the appeal against the Libyan's conviction for the Lockerbie bombing.
Speaking at a press conference in Glasgow, Aamer Anwar said the documents would now be delivered to the Scottish Criminal Cases Review Commission for consideration, according to reports from STV.
The appeal is backed by long-time campaigner Dr Jim Swire and 23 other British relatives of victims of the bombing, along with six members of Mr Megrahi's family, who are not being identified for safety reasons.
ITN Scotland correspondent Debi Edward is at the press conference announcing an appeal against the conviction of Abdelbaset al-Megrahi for the 1988 Lockerbie bombing.
Mr Megrahi's family say they are seeking justice for the victims of the atrocity, as well as for Mr Megrahi himself.
The family of Megrahi are behind this attempt for a new appeal and say they want justice for the 271 victims - includes Megrahi #lockerbie
Lawyers are trying to relaunch an appeal that Mr Megrahi had prepared prior to his release from jail in 2009 on compassionate grounds.
Relatives of Abdelbaset al-Megrahi, the only man convicted of the 1988 Lockerbie bombing, have launched an appeal to posthumously clear his name.
Mr Megrahi was convicted of the bombing but released from a Scottish prison in 2009 on compassionate grounds as he had cancer. He later died in Libya in 2012.
Lawyer Aamer Anwar announced the appeal at a press conference alongside Dr Jim Swire, whose daughter Flora died in the atrocity and who has campaigned for the case to be re-opened.
Iran denied any involvement in the Lockerbie bombing in the face of the new allegations it contracted Palestinian and Syrian militants to carry out the attack.
New documents obtained by Al-Jazeera claim to show Iranian militants were behind the 1988 attack that killed 270 people. Foreign Ministry spokeswoman Marzieh Afkham told AFP:
We reject any claims of Iranian involvement in this act of terror. Iran's stance not only on this case but on all terrorist-related issues is quite clear: Iran flatly denies (links) to any act of terror.