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Peter Morrison / AP
Police Service of Northern Ireland officers carry the coffin of their colleague Ronan Kerr to a funeral mass at the Church of Immaculate Conception in Beragh, Northern Ireland on Wednesday, April, 6. PSNI officer Kerr was killed Saturday in a car bomb attack at his home in Omagh. Government and church leaders from across Ireland joined several thousand mourners Wednesday for the funeral of a Catholic policeman slain by IRA dissidents &amp;amp;amp;mdash; a rare killing that has highlighted the dramatic social changes of Northern Ireland's peace process.