Senator George J. Mitchell sits beside Simon Coveney the Irish minister for foreign affairs and trade Queen's University Belfast, Tuesday, April 10th, 2018. Tuesday marks 20 years since politicians from Northern Ireland and the British and Irish governments agreed what became known as the Good Friday Agreement. It was the culmination of a peace process which sought to end 30 years of the Troubles. Two decades on, the Northern Ireland Assembly is suspended in a bitter atmosphere between the two main parties. Photo/Paul McErlane