A United Nations special rapporteur could be asked to examine the role of the British security forces in up to 40 killings in Co Tyrone.
The UN has already been approached about three separate cases after relatives of the deceased claimed that the British government had failed to cooperate fully with coroners' inquests.
The move was announced yesterday (Tuesday) at a press conference in Cookstown, which was attended by relatives of a number of alleged victims of state collusion.
Yesterday's event was also supported by a number of leading nationalist and republican politicians.
The most high profile of the cases concerns the murder of 76-year-old Roseanne Mallon who was shot dead by a UVF murder squad at her home outside Dungannon in May 1997.
It later emerged that British soldiers had been watching the Mallon home at the time of the shooting but had alleg-edly been ordered not to apprehend the killers.
Ms Mallon's nephew, Martin Mallon, said he wanted the British government to admit the true extent of state involvement in his aunt's death.
"Who ordered the soldiers to stay where they were when there was a 76-year-old woman lying dying in the kitchen?" he asked.
Mr Mallon was joined by Roisin Ui Mhuiri whose brother Kevin Barry O'Donnell was killed alongside Peter Clancy, Sean O'Farrell and Daniel Vincent at Clonoe, near Coalisland, in a planned SAS ambush in February 1992.
Also at the event was Rosemary Ryan, whose brother Peter was shot dead along with three other IRA men by the SAS as they travelled through Coagh in a stolen car.
In that case police told a preliminary inquest hearing that material evidence had been destroyed after it was contaminated by asbestos dust while in storage at Gough Barracks.
"As ordinary families coping with the horrific trauma of how our loved ones were killed we have had to cope with the total absence of proper investigations and the extraordinary delay in even having an inquest which could never deliver the facts," Ms Ui Mhuiri said.
Relatives of victims in other cases of alleged state collusion indicated yesterday that they wanted to be included in any UN investigation.
Mark Thompson, of Relatives for Justice, said there had been 40 people from Co Tyrone killed by the security forces over the past 20 years.
Sinn Féin Mid Ulster MP Martin McGuinness, who attended the briefing along with Westminster colleagues Gerry Adams, Michelle Gildernew and Pat Doherty, said the families' action would bring "into play a very important body which has not been slow in the past to speak out in opposition to British state policy in the north of Ireland".
SDLP Fermanagh and South Tyrone assembly member Tommy Gallagher said the families were "entitled to know all of the facts surrounding the killings".
