The conference is going on for three days.

9.
(left to right) Gary McMichael, John Alderdice, Gerry Adams and Liz O'Donnell, attending the three-day international conference at Queen's University Belfast to mark the 25th anniversary of the Belfast/Good Friday Agreement. Picture date: Monday April 17, 2023. Photo: Niall Carson

10.
George Mitchell speaking during the three-day international conference at Queen's University Belfast to mark the 25th anniversary of the Belfast/Good Friday Agreement. Picture date: Monday April 17, 2023. PA Photo. See PA story ULSTER Agreement. Photo credit should read: Niall Carson/PA Wire Photo: Niall Carson

11.
Hillary Clinton speaking during the three-day international conference at Queen's University Belfast to mark the 25th anniversary of the Belfast/Good Friday Agreement. Picture date: Monday April 17, 2023. PA Photo. See PA story ULSTER Agreement. Photo credit should read: Niall Carson/PA Wire Photo: Niall Carson

12.
The audience give a standing ovation to Hillary Clinton and George Mitchell as they arrive on stage during the three-day international conference at Queen's University Belfast to mark the 25th anniversary of the Belfast/Good Friday Agreement. Photo: Niall Carson

