A man who lost his daughter in the Lockerbie bombing has urged people to pray for the family of Abdelbaset al-Megrahi, the only man convicted of the attack.
Speaking at a memorial service in Westminster Abbey, Dr Jim Swire said:
When I first met the late Abdelbaset al-Megrahi face to face in Greenock prison, though he was a practising Muslim, he had bought me a Christmas card in the prison shop. In it he had written 'Dr Swire and family, please pray for me and my family'.
He died, my friend.
Over Christmas, if you pray, please pray for his innocent family but also for all those who wrestle with hatred, that they may be healed by God's love.
US Attorney General Eric Holder hailed the residents of Lockerbie, describing them as "generous" and "determined", as the 25th anniversary of the tragedy was marked in the UK and US today.
Mr Holder said that families and friends of the victims who then went on to fight a legal battle were "selfless". He added:
Although a quarter century has passed since the world was shaken and so many lives were devastated by a heinous and cowardly act of terror, no amount of distance or time can ease the pain or erase the loss that was inflicted on that day.
We keep calling for change and fighting for justice on behalf of those no longer with us. We rededicate ourselves and our nation to the qualities that define the men and women that we lost. And we continue to be drawn together on this day.
US Attorney General Eric Holder and other officials will speak at a ceremony at Virginia's Arlington National Cemetery to remember the 270 victims killed in the Lockerbie disaster. Flags were held by servicemen, as the names of those killed were read out.
Another remembrance service for the victims of the Lockerbie bombing has started at Westminster Abbey.
A silence will be observed at 7:03pm at the moment the bombing took place 25 years ago today.
The names of those killed in the Lockerbie bombing are being read out in a remembrance service at Arlington National Cemetery in the US state of Virginia.
A service is just beginning at Dryfesdale Church in Lockerbie to mark the 25th anniversary of the bombing.
The service, which has the theme 'Looking Forward', is being led by students from a scholarship programme between Lockerbie Academy and Syracuse University.
Some 35 students from the university, in upstate New York, were killed in the disaster.
Today's statement from the British, US and Libyan governments follows an interview ITV News did earlier this week with the justice minister from Libya, in which he said he was now willing to cooperate with police in the US and UK.
The Foreign Office has now welcomed that development and said that it looks forward to visiting Libya in the new year and to getting access to information and witnesses to progress their investigation.
Scotland's Lord Advocate has previously said there are still people out there with blood on their hands for this atrocity.
A memorial service has taken place in the southern Scottish town of Lockerbie where Pan Am flight 103 came down on the evening of December 21 1988.
Wreaths were laid by the families of the victims of the Lockerbie bombing, many of whom had made the journey from the US to be there.
The service was led by the Rev John MacLeod, while readings and prayers were given by representatives of the Lockerbie Corps, Salvation Army, and the Queen.
The UK, US and Libya are to further "deepen" their cooperation, as the 25th anniversary of the Lockerbie bombing was marked in a memorial service today. In a joint statement, they said:
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. We are committed to cooperate fully in order to reveal the full facts of the case.
We are striving to further deepen our cooperation and welcome the visit by UK and US investigators to Libya in the near future to discuss all aspects of that cooperation, including sharing of information and documents and access to witnesses.