The UK, US and Libyan governments have vowed to work together to reveal "the full facts" of the Lockerbie bombing which claimed 270 lives.
The administrations also expressed their deep condolences to the families of the victims. The announcement came in a joint statement as memorial events were held on the 25th anniversary of the tragedy.
They said they wanted "all those responsible for this most brutal act of terrorism brought to justice".
The statement by the three administrations said: "On the 25th anniversary of the bombing of Pan American flight 103 over Lockerbie on 21 December 1988, the governments of Libya, the United Kingdom and United States of America reiterate their deepest condolences to the families of the victims of this terrible crime.
"We want all those responsible for this most brutal act of terrorism brought to justice, and to understand why it was committed.