The Smithwick Tribunal has found evidence of Garda collusion in the murder of two RUC officers in 1989.
The tribunal's final report, published this evening, concludes that - on the balance of probability - there was collusion between the IRA and unnamed members of the Gardaí.
The report released this evening finds that the actions of the Gardaí was the trigger for an operation that resulted in the deaths of Chief Superintendent Harry Breen and Superintendent Bob Buchanan in Armagh.
The two RUC officers were returning from a meeting with Gardaí in Dundalk when they were killed in an ambush by the Provisional IRA.
The report says that a Garda action was the "trigger" for the operation, but that there was no direct evidence of collusion in the attack.
He says that while two named Gardaí - Detective Sargeant Owen Corrigan and Sargeant Kevin Colton - DID have inappropriate relations with the Provisional IRA during the 1990s, there was not enough evidence to link them to the IRA operation that killed the two RUC men.
They were the highest-ranking members of the RUC to be killed throughout the Troubles in Northern Ireland.