In November 1991, nearly three years after the attack, US and British investigators on the case indicted Abdelbaset al-Megrahi and Al Amin Khalifa Fhimah on 270 counts of murder, conspiracy to murder and violating Britain's 1982 Aviation Security Act.

Investigators believe the men were Libyan intelligence agents.

However, Libya refused to hand the suspects over, prompting the United Nations Security Council to impose sanctions on air travel and arm sales in the country.

In August 1998, the UK and US proposed trying the suspects in the Netherlands under Scottish law, with the pair finally taken into custody and formally charged in April 1999.

The trial of the pair began in May 2000 at a specially convened Scottish court sitting in the Netherlands named Camp Zeist. Both pleaded not guilty to the murder charges.

Fhimah was found not guilty and was allowed to return home, but Megrahi was found guilty and given a recommended minimum of 20 years in prison due to the nature of the crime.

Megrahi was transferred to a Glasgow prison, and spent the rest of his life attempting to appeal his conviction.

After one unsuccessful attempt, the minimum term was upped to 27 years.

In 2003, Libya agreed to pay compensation to the families of those who died in the Lockerbie Bombing – totalling a fund of £1.7billion.

In 2008, it was announced via Megrahi’s lawyer that he had prostate cancer, and in October that year Jim Swire – father of Lockerbie victim Flora Swire – called for Megrahi to be released, stating it was “common humanity”.

It was initially ruled he would remain in jail for the process of his second conviction appeal, but he would eventually be released in August 2009 on compassionate grounds due to the severity of his illness.

In turn, he dropped his second attempt at appeal and was flown back to Libya on the jet of Libyan leader Muammar Gaddafi. Megrahi died at his home in Tripoli in May 2012.

Questions were soon raised in Scottish Parliament over the decision to release him, with Justice Secretary Kenny MacAskil stating he stood by the decision.

In 2017, Megrahi’s family launched a new appeal to posthumously overturn his conviction, but the Court of Criminal Appeal in January 2021 decided to uphold the original verdict.

In December 2020, the US announced they had filed new charges against another Libyan, Abu Agila Mohammad Masud, who was suspected of making the bomb.

On December 11, 2022, Abu Agila Mohammad Masud, was announced to be in US custody, It was reported that in a confession extracted more than 10 years ago, while he was in custody in Libya on unrelated charges, he admitted to setting the timer for the bomb.

Each of the charges Abu Agila faces are punishable by a sentence of up to life in prison, or a fine of up to $250,000 a piece.

It has been already ruled he will not face the death penalty if convicted.

He is scheduled to face trial in Washington in May 2025.

Lockerbie ran for four episodes, tracking the initial disaster through to the most recent developments surrounding the case.

The episodes play out as follows:

Episode One

Run Time: 50mins

In 1988, the families of those on board flight Pan Am 103 learn that the plane has crashed over Lockerbie, Scotland, killing 270. A terrorism investigation begins.

Episode Two

Run Time: 50mins

The prime suspects for the bombing of flight Pan Am 103 are a Palestinian terror group funded by Iran. But Scottish and FBI investigators are led elsewhere.

Episode Three

Run Time: 50mins

A Libyan double agent provides the evidence needed to bring the two suspects to court. The trial gets underway, but a key witness changes his story.

Episode Four

Run Time: 50mins

A shock verdict leaves the families unsatisfied. Doubt is cast on the court's decision, and 34 years after the bombing, a new suspect is taken into US custody.

All four episodes of Lockerbie are available now.

You can watch the series on Sky Crime, on demand via SkyGo or by streaming on NOW.

A TV series starring Colin Firth – based on Jim Swire’s search for justice for his daughter’s death after the Lockerbie Bombing – is coming soon to Sky.

Find out more information about it here.