The final report of the Commission of Investigation into the 1974 Dublin and Monaghan bombings has been given to the Taoiseach, Bertie Ahern.
The bombings claimed the lives of 33 people in May 1974 - the worst loss of life in a single attack during the Troubles.
The report has to go to the Cabinet, but Mr Ahern said he intended to publish it as soon as possible.
In 2003, Mr Justice Henry Barron reported on foot of his inquiry into the bombings that there were grounds for suspecting that the bombers may have had assistance from members of the security forces.
Judge Barron also said it was probable at best that the Northern Ireland forces did not share information they had with the gardaí, or follow it up, and that suggestions of collusion were 'neither fanciful nor absurd'.
Senior Counsel Paddy MacEntee was then asked to examine why the garda investigation was wound down a few months after the bombings, why various leads were not followed up and also to examine the extent of documents relating to the attacks that have since gone missing.
His inquiry was originally expected to last around six months, but has lasted almost two years.
In interim reports, Mr MacEntee reported he had meetings and received co-operation from various entities and agencies in the UK.
It is believed these include military and intelligence organisations such as MI5.
Mr MacEntee's report is the first under the new Commission of Inquiry Act, which was designed to examine issues of public importance without having to set up costly tribunals.
