Taoiseach Bertie Ahern is to meet the families of Miami Showband members today.
The Taoiseach is expected to discuss the publication of an Oireachtas subcommittee report into a number of atrocities, including the Miami Showband massacre.
The inquiry concluded that "widespread collusion" between British security forces and loyalist paramilitaries lay behind a number of atrocities on both sides of the Border that killed 18 people.
The subcommittee said it was "horrified" that people employed by the British authorities to preserve peace and protect people were "engaged in the creation of violence and the butchering of innocent victims".
It concluded there were acts of "international terrorism" involving collusion by British security forces.
Speaking last night, Mr Ahern said it was now "absolutely essential" the British government co-operate fully with investigations into allegations of British collusion in loyalist attacks during the mid-1970s.
In July 1975, the Ulster Volunteer Force gunned down three members of the Miami Showband, killing two of their members, after a bomb attack the loyalist gang was planning backfired.
The showband, who were one of the country's most popular live bands in the 1970s, were returning from performing at a dance in Banbridge, Co Down, when their minibus was flagged down by men dressed in army uniforms on the road to border town of Newry.
Band members were told to line up in a ditch while UVF members posing as Ulster Defence Regiment members tried to plant a bomb inside the minibus that they hoped would explode later on as the musicians headed home to Dublin.
As the gang loaded the bomb, the musicians were asked for their names and addresses; the bomb then exploded prematurely, killing UVF members Harris Boyle and Wesley Sommerville.
After the explosion, the UVF gang opened fire on the band, killing lead singer Fran O'Toole, trumpet player Tony Geraghty and Brian McCoy. Guitarist Stephen Travers and Des Lee survived.