Northern Ireland's Policing Ombudsman will next week publish the findings of an investigation into one of the most controversial incidents of the Troubles, the IRA bombing of Claudy, Co Derry.

Nine people were killed in July 1972 when a car bomb exploded outside a local pub, followed minutes later by two more explosions outside the Post Office and the Beaufort Hotel.

Cardinal William Conway, the then leader of the Catholic Church in Ireland, and William Whitelaw, the then Northern Secretary who went on to become deputy prime minister in the British government, will feature in the investigation.

The investigation sought to determine whether a Catholic priest, Derry based Fr James Chesney, was a suspect in the Claudy bombing.

RTÉ News understands the Ombudsman's report is going to cause grave embarrassment for the Catholic Church and the British government.

Nobody has ever been charged or convicted in relation to the crime.