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Former Taoiseach Mr Bertie Ahern, former British Prime Minister Tony Blair and former US Senator George Mitchell listens to former US President Bill Clinton  at  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.