Retired Stasi spies are being investigated over whether they were connected to the Lockerbie bombing.
A total of 270 people died after Pan Am flight 103 was blown up over Scotland in 1988.
Officials from the Scottish Crown Office are quizzing five former members of the East German secret police aged 78 to 89 over Britain’s deadliest terror outrage.
A spokesman said: “Prosecutors and police, working with UK Government and US colleagues, will continue to pursue this investigation, with the sole aim of bringing those who acted along with Al Megrahi to justice.
“As this is a live criminal investigation, it would not be appropriate to comment.”
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The former Stasi officials were members of a secretive counter terror unit called Department XXII.
They reported to Erich Mielke, a senior member of East Germany’s politburo, and developed close ties with Libyan terrorists during the 1980s.
It is unclear whether the officials being questioned are being treated as suspects or why the link has emerged after so many years.
Former Libyan intelligence officer Abdelbaset al-Megrahi, the only person ever convicted of the bombing, died in 2012.
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Investigators do not believe he acted alone.
Others, including relatives of some of the victims, believe he was wrongly convicted and are seeking an appeal.
A man thought to have supplied a timer for the bomb had Stasi links.
And the unit had helped terrorists previously.
Notorious Venezualan terrorist Carlos the Jackal was apparently given explosives by a Stasi officer via the Syrian embassy in 1983.
It was used to make a bomb which hit the French consulate in west Berlin, killing one person and injuring 23.
