The SDLP's spokesperson for policing, Mr Alex Attwood, has said the Nally Report into Garda handling of the Omagh bombing raises more questions than answers.
Mr Attwood said yesterday's report would "not satisfy the right to truth the Omagh families are entitled to."
The Minister for Justice told the Dáil yesterday that allegations of Garda inaction in the Omagh bombing, ministerial interference in the judicial process, and unlawful conduct by senior Garda officers were without foundation.
It was later revealed however, that the Nally group did not question Det Sgt John White's alleged informer, Mr Pat Dixon, who has claimed in the past that he infiltrated the "Real IRA". Det Sgt White was the source of the allegations which led to the Nally investigation.
Commenting on the controversy, Mr Attwood said there were major matters that needed to be addressed "before any such conclusions can be properly drawn."
Mr Attwood asked: "In particular, were all relevant serving and retired police officers interviewed? If Nally had powers to compel witnesses, would he have been able to gather more information, including from informers? Also, if there had been greater share of intelligence information about the bombings in the months that preceded Omagh, could this have frustrated the bombers' intentions?
"These matters highlight why Nally raises more questions than it gives answers. It is clear that stones have been left unturned and the Omagh families still deserve more. The families do not know the full truth. Nally does little to move things forward."
The Fine Gael leader, Mr Enda Kenny, told the Dáil yesterday he was not happy with the report because a "key participant" was not interviewed during its preparation.
This was a "major omission" in a report which sought to draw conclusions from seriously conflicting evidence, and he was disappointed the group did not make a greater effort to interview this person.
The Labour leader, Mr Pat Rabbitte, said the Government had to answer a fundamental question on whether it was going to support civil litigation by the families of the Omagh victims against the suspects, and the level of assistance it was going to give.
The Sinn Féin leader in the Dáil, Mr Caoimhghín Ó Caoláin, said he was unhappy that his party had not received a copy of the report when other Opposition parties had.