The group representing survivors of the 1974 bombings of Dublin and Monaghan has said next month's visit by Britain's Queen Elizabeth should include confirmation that British files relating to the atrocity will be made available.
Justice for the Forgotten says the move would be a significant gesture of reconciliation.
The group says the British authorities did not co-operate fully with the Barron inquiry into the bombings and requests for files to be released have been ignored.
On the evening of Friday 17 May 1974, four no-warning car bombs exploded on Parnell Street, Talbot Street and South Leinster Street in Dublin and on the North Road in Monaghan town.
34 people died in what was the single biggest loss of life in any atrocity during the Troubles.
The timing of the visit of the British Queen has been described as an 'extraordinary coincidence' by Justice for the Forgotten.
Its spokesperson Margaret Urwin said the British government has ignored repeated calls for documents relating to the bombings to be made available.
The group said it hopes the historic royal visit has some significance and will lead to a meaningful gesture.
