The Canadian judge investigating alleged security force collusion in a number of murders on both sides of the Irish border has uncovered lines of inquiry that have not been followed by detectives.
Delivering his report on allegations of RUC collusion in the murders of four people in Northern Ireland, former chief justice Peter Cory warned his findings must not be interfered with.
Mr Cory will travel to Ireland today to deliver his report on accusations that two RUC officers and a High Court judge and his wife were murdered by the IRA with the assistance of gardaí.
He delivered his report to Northern Secretary Mr Paul Murpghy in London on suspected collusion in the killing of solicitors Ms Rosemary Nelson and Mr Pat Finucane; Portadown father-of-two Mr Robert Hamill; and LVF leader Billy Wright.
Ms Nelson, a high-profile lawyer known for defending Republican suspects was killed in a car bomb in 1999.
Mr Finucane was also widely known for defending IRA suspects and was shot dead at his home in Belfast in 1989.
Mr Hamill was beaten to death by a gang in Portadown in 1997. It is alleged the attack was in full view of an RUC patrol.
Mr Wright, leader of the LVF was shot in prison, allegedly by the INLA, in 1997.
Mr Cory today refused to discuss his recommendations but cautioned against any British government changes to his findings on the grounds that when his report is eventually published it could contain details that would compromise ongoing investigations. "I would make a lot of noise," he warned.
The retired Canadian Supreme Court judge has spent the last 14 months investigating each of the cases after being appointed by the authorities in London and Dublin.
Today he insisted his inquiry, which was agreed by the Irish and British governments and political parties during peace process talks at Weston Park in 2001, provided for public inquiries if needed.
Anguished relatives have hit out at the government over the delay in publishing the judge's findings.
Fears have also been expressed that Mr Justice Cory's independence could be compromised as legal chiefs trawl through the document in order to blank out any names or information relevant to ongoing criminal investigations.
Mr Justice Cory disclosed his work had uncovered details not previously known to the detectives. He said: "I have seen things that because of the routes followed are additional to some of the police investigations.
"I have had tremendous co-operation from Sir John Stevens and his team and I like to think I co-operated with him in the same way".
Mr Cory will present his findings to the Irish Government on the IRA murders of Lord Justice Maurice and Lady Cecily Gibson and RUC officers Supt Harry Breen and Insp Bob Buchanan later today.
The RUC men were shot dead on the border by the IRA after returning from a security meeting with gardaí in Dundalk in 1989.
Lord Justice and Lady Gibson were killed in 1987 by an IRA bomb as they crossed the border after holidaying in the Republic.
It has been alleged that gardaí provided information about the victims' locations on the day of their murder.
The governments will only see the reports on the security forces within their repective jurisdictions.