The families of the victims of the 1974 Dublin and Monaghan bombings this evening said they received "no comfort" from the findings of the MacEntee investigation into the atrocities.
Gerry O'Neill, solicitor for the Justice for the Forgotten group, said the families had always known they had been forgotten, but today's report confirmed it.
He said Patrick MacEntee's report, published today after two years of investigation, showed that "as far as the Garda Siochána was concerned, we were forgotten".
A total of 33 people, including a pregnant woman, were killed in the 1974 atrocities.
Mr O'Neill said the bombings constituted the "greatest unsolved mass murder in the history of the State".
He claimed that due to "an appalling and lamentable chronicle of errors and failures by our police force", vital documentation and evidence had been lost, leaving the Oireachtas commission unable to complete its investigation properly.
He said it had been a routine practice of the Garda in the 1970s to open files on cases, but fail to list the documents entered inside, thereby allowing for files to "disappear".
This, he said, was a "chronic and systematic practice" of the Garda in dealing with crimes throughout the period.
Mr O'Neill said if such "a total lack of care and gross misconduct" had happened in any other EU country, resignations would have been handed in. He said those responsible for the failed Garda investigation "know who they are" and called for them to resign.
Cormac Ó Dúlacháin SC, counsel for Justice for the Forgotten, said the report shows it appears impossible to investigate why the initial Garda investigation was wound down without conclusion. However, he said there was "a matter which is not at an end" - who was responsible for the bombings.
Mr Ó Dúlacháin said the reason the report had found no evidence of collusion was because there existed an "absolute fear to pursue an inquiry into the matter" at Oireachtas level. He said there was a "dark hand" involved in the Dublin and Monaghan bombings, adding "the Oireachtas Commission has a duty to find it".