Libyan authorities have maintained their silence on the release of Megrahi from a prison in Glasgow.
The full truth about the bombing may have died with al Megrahi, who never provided details.
British authorities rejected that al Megrahi's release was tied to British business deals with Libya.
After the Gadhafi regime fell last year, U.S. officials renewed their call for al Megrahi's imprisonment.
Megrahi is the only person to be convicted over the 1988 bombing which claimed 270 lives.
"No one can object to Libyans expressing their feelings if Megrahi comes back, " he said.
Just a few days later, on August 20 2009, al-Megrahi was freed on compassionate grounds.
Dr Jim Swire, who lost his daughter Flora, believes that Megrahi was wrongly convicted.
But to be eligible for transfer, on August 18th Mr Megrahi dropped this appeal.
ECONOMIST: A controversial decision to release a Libyan prisoner
Ammerman said Gadhafi's ouster and death also helped reduce some of his anger at al Megrahi's release.
If Megrahi had not been released, Cohen said, he might have talked when the Gadhafi regime fell.
After months of prosecution evidence, lawyers for Mr Al Megrahi began presenting his defence case in December.
At the time, Scottish officials said the medical advice was that al-Megrahi would live about three months.
The British ambassador in Tripoli, Vincent Fean, "expressed relief" when Megrahi was released, the US cables reported.
There is, thus, no obvious benefit to sending Mr Megrahi home, and there is clearly a cost.
Megrahi was serving a life sentence with a minimum term of 27 years after being convicted in 2001.
Mr Miliband said the decision to release Megrahi had been a choice for the Scottish justice secretary alone.
However, Bob Monetti, an American whose son Rick was also killed, said Megrahi should not be given bail.
Megrahi's daughter Ghada told the BBC he was at home with his family.
Megrahi was released from a Scottish prison two years ago on health grounds.
"He was not the only person taking orders, " Cohen said of al Megrahi.
He said the release of Megrahi was a matter for the Scottish government.
The same official would offer no guarantees that al-Megrahi's return would be subdued.
Megrahi was also said to have loaded the bomb onto an Air Malta Flight at the island's Luqa airport.
There have been calls for Megrahi to be returned to the UK, or to be tried in the United States.
Cummock said she previously met with Blair, who told her the Scottish authorities were the ones who released al Megrahi.
Mr Gauci picked out Megrahi as the man who bought clothes later found in the suitcase that contained the bomb.
Scottish authorities declassified a huge trove of documents related to the case in September 2009, shortly after al-Megrahi was released.
Two of Megrahi's children, son Khaled, and daughter Ghada, watched as he gave evidence at Camp Zeist in the Netherlands.
On Megrahi, look, I'm not standing here today and saying it was a bad decision to release Megrahi because I'm here.
WHITEHOUSE: President Obama and Prime Minister Cameron at the White House | The White House
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