The US alleges that Abu Agila Masud was a Libyan intelligence operative and played a key role in the 1988 attack, which left 270 people dead.

Scottish and US officials announced on Sunday that Masud was in US custody. He is the first person charged on US soil in connection with the attack.

A device on board the Boeing 747 exploded as the flight was flying over the English-Scottish border, killing 243 passengers, six crew members, and 11 local residents on the ground - including a family of four.

The dead were citizens of 21 different countries, including 190 Americans and 43 Britons.

It remains the deadliest terrorist incident to have taken place on British soil.

At Monday's hearing, US Magistrate Judge Robin Meriweather decided to postpone the formal reading of charges until Masud obtains legal counsel for his trial.He did not enter a plea.

He spoke his full name into the record and was informed by the judge that a translator was present to interpret court proceedings into Arabic for him. He was ordered to remain in custody at least until a detention hearing on 27 December.

Masud could face life imprisonment

Masud is facing multiple charges, including destruction of aircraft resulting in death. Prosecutors said at Monday's hearing that they would not seek the death penalty and Masud could face life imprisonment if convicted.

Wearing a teal prison jumpsuit, he lightly limped into court with a medical mask covering his white beard.

As the judge read out the three charges, he interrupted to say in Arabic: "I can't talk until I've spoken to my attorney."

He is currently seeking legal counsel, which the judge said was his right after Masud rejected the offer of free representation from the public defender's office.

Some of the families of the victims were in court and they told the BBC beforehand that they were nervous. They sat silently as the hearing got under way.

Each of the charges he faces carries a possible sentence of life in prison, the death penalty, or a fine of up to $250 000.

'Death penalty not legally available at time of crime'

But US prosecutors told the court they would not seek the death penalty, as they believe the punishment was not legally available at the time of his alleged crime.

The US Justice Department first announced criminal charges against Masud in December 2020. At the time, US prosecutors alleged that he had worked for Libyan intelligence in a number of roles between 1973 and 2011, including as an explosives expert.

The case against Masud partly rests on an interview he gave to Libyan officials in 2012, after he was taken into custody following the overthrow of Muammar Gaddafi's government. In the interview, he admitted building the bomb used in the attack and setting its timer to explode while the aircraft was in flight. Masud also claimed that Gaddafi had thanked him and two co-conspirators "for their successful attack" on the US.

A number of observers have voiced concerns that the confession may have been coerced in the chaotic months following the regime's fall, when Libya did not have a fully functioning legal system.

'Prosecution a major milestone for families of victims'

At a news conference on Monday, Victoria Cummock, whose husband John died in the bombing, called the US prosecution a "major milestone" for the families of the victims.

She added that the apprehension of Masud was the "first tangible step" by US authorities to hold anyone accountable for the bombing after what she described as a "decades-long miscarriage of justice".

It remains unclear how Masud came to be in US custody. In late November, it was reported that he had been kidnapped by armed militia members in Tripoli.

In 2001, one of the other co-conspirators identified by US and Scottish officials, Abdelbaset al-Megrahi, was convicted by a Scottish court convened in the Netherlands for his role in the attack. The Scottish government released him on compassionate grounds in 2009, and he died in Libya three years later.

To date, Megrahi, who has always maintained his innocence, has been the only person convicted in connection with the attack.

Scotland's Lord Advocate Dorothy Bain, who is the most senior Scottish law officer in the government, said in a statement that she would travel to Washington DC next week to meet prosecutors and attend commemorative events with victims' families.

In a statement on Monday, she called the US prosecution of Masud a "legal breakthrough", adding that Scottish authorities welcomed the American inquiry.

"The recent developments demonstrate that there can be no time limits placed on the pursuit of justice," she said.

BBC