The group representing survivors and families of those killed in the Dublin and Monaghan bombings have held ceremonies to mark the 31st anniversary of the attacks today.
On Friday, May 17th, 1974, three car bombs exploded without warning on Parnell Street, Talbot Street and South Leinster Street in Dublin city centre, killing 26 people and an unborn child.
The Taoiseach Bertie Ahern
The bombs went off at 5.30pm when tens of thousands of people were leaving work in the city.
A fourth bomb exploded in Monaghan town 90 minutes later, killing another seven people.
The attacks were blamed on loyalist paramilitaries, but no one has been charged in connection over the worst single day's death toll in the history of the Troubles.
The Justice for the Forgotten group held a wreath-laying ceremony in Talbot Street this morning, followed by a Mass of Remembrance at the Pro-Cathedral.
The group wants the Government to establish a public judicial Tribunal of Inquiry. "Only then can our members find peace of mind and closure to their suffering," it said in a statement.
The Taoiseach said last week he would raise the issue of Britain's failure to co-operate into the Barron Inquiry into the bombings with new Northern Ireland Secretary Peter Hain.
"However, I must be honest . . . and point out that I believe we will never be satisfied on this issue," he told the Dáil.
"The British position on this, both within its security and government systems, and I am sure its legal system if we could ever get to it, is that it has maintained it has made available the information that it has on the subject."
Last month the Government appointed a commission of inquiry into the Garda investigation of the bombings with Patrick MacEntee SC as sole member. This commission had been asked to produce its report within six months.