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Northern Ireland First Minister Peter Robinson (3rd L) addresses the media at Stormont Castle In belfast, Northern Ireland on September 10, 2015. Northern Ireland's First Minister Peter Robinson said he was resigning on Thursday in a crisis, caused by alleged Irish Republican Army (IRA) activity, which is threatening the peace-making process. AFP PHOTO / PAUL FAITHPAUL FAITH/AFP/Getty Images
Northern Ireland First Minister Peter Robinson (3rd L) addresses the media at Stormont Castle In belfast, Northern Ireland on September 10, 2015. Northern Ireland's First Minister Peter Robinson said he was resigning on Thursday in a crisis, caused by alleged Irish Republican Army (IRA) activity, which is threatening the peace-making process. AFP PHOTO / PAUL FAITHPAUL FAITH/AFP/Getty Images

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    Northern Ireland on brink of political crisis

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Northern Ireland on brink of political crisis

The tenuous power-sharing agreement in Northern Ireland is on the brink of collapsing. CNN's Phil Black on the history and uncertain future of the agreement.

Northern Ireland on brink of political crisis

The tenuous power-sharing agreement in Northern Ireland is on the brink of collapsing. CNN's Phil Black on the history and uncertain future of the agreement.