The Government has confirmed it will publish Judge Peter Cory's report tomorrow into controversial killings which involve allegations of Garda collusion with paramilitaries.
The Government received two reports and the British Government received four following Judge Cory's investigation of eight murders involving allegations of state collusion in six controversial cases during the Troubles.
The Canadian judge also investigated the deaths of the deaths of Lord Justice and Lady Gibson in 1987.
Sources have indicated that he found that individual members of the Garda Siochána may have provided information to the IRA killers of RUC Superintendent Bob Buchanan and Inspector Harry Breen as they returned north from a meeting with garda officers in Dundalk.
The British government has indicated it will not publish the judge's findings into four murders in the North alleged to involve police and British army collusion with loyalists.
Speaking after talks in London this evening, Mr Blair said the only reason the Cory Report was not being published now was because the British government needed to make sure it was "properly, legally and judicially covered".
The murders investigated in the North are the 1989 Ulster Defence Association murder of Belfast solicitor Pat Finucane; the beating to death by loyalists of Catholic man Robert Hamill in Portadown in 1997; the Irish National Liberation Army murder of Loyalist Volunteer Force leader Billy Wright in 1997 and the LVF murder of Lurgan solicitor Rosemary Nelson in 1999.
SDLP leader Mark Mr Durkan and Sinn Féin leader Mr Gerry Adams expressed disappointment at Mr Blair's refusal to release the report. Mr Durkan said it was said the British government had gone back on its public commitment to reveal the contents of the report.
But Mr Blair insisted he would publish the report once the legal questions have been addressed.
Both governments have pledged to hold public inquiries into any of the six killings if recommended in the reports.