The son of Lockerbie bomber Abdelbaset al-Megrahi has lost an appeal against his late father's conviction.

The appeal has today been rejected by judges at the High Court in Edinburgh, meaning Megrahi's conviction still stands.

This was the third appeal brought against Megrahi's conviction.

His family have said they are "heartbroken", and plan to appeal against today's decision at the UK Supreme Court.

The bombing of Pan Am flight 103, travelling from London to New York on December 21 1988, killed 270 people in Britain's largest terrorist atrocity.

Former Libyan intelligence officer Megrahi was found guilty in 2001 of mass murder and jailed for life with a minimum term of 27 years.

He was the only person convicted for the attack.

Megrahi died in Libya in 2012, after being released from prison in 2009 on compassionate grounds following a terminal cancer diagnosis.

The latest appeal against his conviction was lodged after the Scottish Criminal Cases Review Commission (SCCRC) referred the case to the High Court in March 2020, ruling a possible miscarriage of justice may have occurred.

Judges then granted his son, Ali al-Megrahi, permission to proceed with the appeal in relation to the argument "no reasonable jury" could have returned the verdict the court did, and on the grounds of non-disclosure of documents by the Crown.

In a statement released through their lawyer Aamer Anwar after the ruling was published on Friday, the family said: "Ali Al-Megrahi, the son of the only man convicted of the Lockerbie bombing, said his family were left heartbroken by the decision of the Scottish courts, he maintained his father's innocence and is determined to fulfil the promise he made to clear his name and that of Libya.

"All the Megrahi family want for Scotland is peace and justice, but as Ali stated today their journey is not over, Libya has suffered enough, as has the family for the crime of Lockerbie, they remain determined to fight for justice."

Megrahi's original trial was held at a special Scottish court sitting at Camp Zeist in the Netherlands.

During the appeal hearing in November, advocate depute Ronald Clancy QC, for the Crown, said trial court judges were fully entitled to infer Megrahi was involved in the Lockerbie bombing.

He said Megrahi's use of a false passport to travel to Malta - from where the plane carrying the bomb left just before the atrocity - taken along with other evidence, combined to form a pattern that suggested his involvement.

Claire Mitchell QC, representing the Megrahi family, said evidence in relation to identification was of "poor quality" and the dock identification, when shopkeeper Tony Gauci said Megrahi resembled the man who bought the clothing later found in a suitcase containing the bomb, was "virtually of no value".

Mr Clancy said that ignores the "important point" that the dock identification was "simply the last of a series of consistent resemblance identifications going back to February 1991".

Megrahi's first appeal against his conviction was refused by the High Court in 2002 and was referred back five years later after an SCCRC review.

He abandoned this second appeal in 2009, shortly before his release from prison on compassionate grounds.

Last month, on the 32nd anniversary of the bombing, the US Justice Department charged a "third conspirator" in connection with the atrocity.

The US alleges Abu Agila Mohammad Masud Kheir Al-Marimi was the bombmaker and has charged him with terrorism-related crimes.

A second suspect, Al Amin Khalifa Fhimah, stood trial with Megrahi but was acquitted.

Scotland's Lord Advocate James Wolffe QC said the investigation into the atrocity continues and there remain suspects under active investigation.

He said: "The bombing of Pan Am 103 is, to this day, the deadliest terrorist attack on UK soil and the largest homicide case Scotland's prosecutors have ever encountered in terms of scale and of complexity.

"The evidence gathered by Scottish, US and international law enforcement agencies has again been tested in the Appeal Court, and the conviction of Abdelbaset Ali Mohmed Al Megrahi stands."