Megrahi, who was released from a Scottish prison on compassionate grounds in August, is running an internet campaign to prove his innocence.

Megrahi was released from a Scottish prison in August after doctors concluded he had less than three months to live.

He was held in Scottish prisons until he was released on compassionate grounds on 20 August 2009 because he had terminal prostate cancer.

Scottish prisons process roughly 19,000 people a year who are either going in or coming out.

He visited Elizabeth Fry who, with her brother, Joseph Gurney, had written a book about the state of Scottish prisons in 1819.

If convicted, the suspects could serve up to 30 years in a Scottish prison, American officials said.

There are now opportunities for inmates in the majority of Scottish prisons to gain National Certificate awards across a variety of vocational areas such as.

He switched loyalties to the English and died in a Scottish prison.

He said: "We've expressed our strong conviction that Al Megrahi should serve out the remainder - the entirety - of his sentence in a Scottish prison."

The bomber returned to jubilant scenes in Libya on August 20 last year after being released from a Scottish prison.