A report from Mr Justice Barron into Dublin bomb attacks and other incidents in the early seventies has been strongly critical of the British authorities.
The report said he was surprised and disappointed at what it called a lack of co-operation from officials in the UK.
This is the second report from Mr Justice Barron and investigates the Dublin bombings of December 1972 and January 1973.
It also inquired into a car bomb at Belturbet in Co Cavan in December 1972, bomb attacks in Clones, Co Monaghan, and a number of murders in Co Donegal.
Two CIÉ employees, 30-year-old bus driver George Bradshaw and 24-year-old bus conductor Tommy Duffy, died in the December 1972 attack.
Another CIÉ worker, 21-year-old Scot Tommy Douglas, who was also working as a bus conductor, died in the 1973 bombing.
Two young teenagers, Geraldine O'Reilly and Patrick Stanley, died in the Belturbet blast.
Mr Justice Barron concluded that while suspicions linger of British collusion in the 1972 attack there is no firm evidence of this. It found that there was also no evidence of British security force involvement in the 1973 attack nor was there evidence to support Garda intelligence that the UVF was involved.
The report is highly critical of the British authorities and what it calls a surprising and disappointing lack of co-operation.
The Taoiseach said he hoped the report would help ease the pain of relatives, but tonight families said they were still angry.
Justice Henry Barron's first inquiry, into the 1974 Dublin and Monaghan bombings in which 34 people died, found no evidence of collusion between British military officials and loyalists believed to be behind the attacks.
However, it strenuously criticised the way the Fine Gael/Labour government of the day handled the investigation.
