The Taoiseach will tomorrow receive the report by Justice Barron into the 1974 Dublin and Monaghan bombings which killed 33 people.
The Barron inquiry was set up by the Government following decades of speculation that the bombings happened with the connivance of the British security services.
Although the report was originally expected a year ago, the work of the inquiry was hampered by a lack of co-operation from the British authorities.
The Dublin-Monaghan bombings remain the worst act of violence in the 30 years of conflict since the outbreak of the Troubles.
At approximately 5.30 p.m. on May 17th, 1974, three car-bombs exploded in Dublin city centre. The bombs were strategically located and timed to kill as many civilians as possible.
In Parnell Street, Talbot Street and South Leinster Street that Friday rush hour, 26 people died and more than 200 were injured.
Ninety minutes later a car-bomb exploded on North Street, Monaghan. Seven people died and more than 40 were injured. No warnings were given. No charges were ever brought against the perpetrators.
A Government spokeswoman said the Taoiseach is expected to receive the report tomorrow evening, but it will not be made publicly available at that time. The Barron report will be considered by the Government over the coming weeks.