A panel of international legal experts has concluded that members of the RUC and British army colluded with loyalist paramilitaries in at least 74 sectarian murders during the 1970s.
The four-strong team was commissioned by the Pat Finucance Centre to look into 25 separate incidents in which loyalists killed a total of 76 people.
It says it has found significant and credible evidence of collusion in 24 of these cases, but was unable to reach a verdict on the murder of Co Armagh taxi driver James Marks and his passenger Joseph Toland.
The panel says it believes the British security services colluded in all the other incidents, including the 1974 Dublin and Monaghan bombings and the attack on the Miami Showband in 1975.
It also says it was told during its investigations that Gardai in the Republic failed to co-operate in bringing republicans to justice for murders north of the border.
The legal experts are calling on both the Irish and British Governments to set up independent inquiries to examine the extent of the collusion.