Scottish police and prosecutors have arranged with the British Foreign Office to interview the former foreign minister of Libya, Moussa Koussa, who defected to Britain last week.
They want to question him about the bombing of Pan Am flight 103 over the Scottish town of Lockerbie in 1988, in which 270 people were killed, the BBC reports.
The only man convicted of the bombing was Libyan intelligence agent Abdelbaset Ali al-Megrahi.
Mr Koussa is believed to have been a senior figure in the Libyan intelligence service at the time.
A Crown Office spokesman said steps were being taken with a view to arranging a meeting with Mr Koussa at the earliest opportunity in the next few days.
Earlier, British Foreign Secretary William Hague said the government would encourage Mr Koussa to co-operate with investigators.
Abdelbaset Ali al-Megrahi was freed from jail in Scotland in 2009 on compassionate grounds and returned to Libya, the BBC reports, where his release and return to a hero's welcome caused a storm of controversy.