Signed in 1973, the Sunningdale Agreement sought to end the conflict by establishing power-sharing government between unionists and Irish nationalists, and ensuring greater co-operation with the Republic of Ireland. In protest, loyalists organized the Ulster Workers' Council strike in May 1974. It was enforced by loyalist paramilitaries and brought large parts of Northern Ireland to a standstill. During the strike, loyalists detonated a series of car bombs in Dublin and Monaghan, in the Republic. This killed 34 civilians, making it the deadliest attack of the Troubles. The strike brought down the agreement and power-sharing government.