Mas’ud had been scheduled to appear in court on May 12, 2025, but US prosecutors and his defence team have jointly asked for the trial to be delayed.

The Libyan national is accused of helping to construct the device that killed 259 passengers and crew on board the London to New York flight, as well as 11 people in Lockerbie, making it Britain’s deadliest terrorist attack.

A motion filed by US prosecutors cited Mas’ud’s treatment for a pre-existing health condition and the complexity of the case as reasons for the delay.

They previously estimated his health issues could cause a 90 to 120-day postponement, but the latest filing suggests an additional delay is required. The lawyers also stated that more time was needed to establish a “reasonable pretrial schedule and to set a future trial date”.

If the judge grants the motion, a status hearing is expected to take place during the week of March 10.

A spokesperson for the Crown Office said: “We appreciate that the prospect of delay will be frustrating for those affected but we urge them not to feel disheartened.

“Scottish prosecutors have a long-standing commitment to pursuing those responsible for the bombing of Pan Am 103. We will move forward with unwavering determination and continue to support US authorities in the prosecution of Mas’ud.”