A retired Supreme Court of Canada judge, Peter Cory was appointed to undertake a thorough investigation of allegations of collusion between British and Irish security forces and paramilitaries in six particular cases in Northern Ireland.
Two of the cases - the killing of two Royal Ulster Constabulary officers and the killing of Northern Ireland Lord Justice Maurice Gibson and Lady Cecily Gibson - relate to allegations of collusion by the Garda Síochána and these reports were submitted to the Irish government.
[1][2] In the case of the two RUC officers, who were killed in an ambush by the Provisional IRA on 20 March 1989, Cory considered all the relevant material, including intelligence reports, and concluded that evidence was revealed that, if accepted, could be found to constitute collusion.
The Smithwick Tribunal issued its report on 3 December 2013, finding there had been collusion between members of the Gardaí and the IRA, which resulted in the deaths of the two officers.
In the case of Lord Justice and Lady Gibson, who were killed in a car-bomb explosion by the Provisional IRA on 25 April 1987, Mr Justice Cory concluded that there is no evidence of collusion by the Garda Síochána or any other Government agency that would warrant the holding of an inquiry.