The Independent Monitoring Commission (IMC) has confirmed the Government's view that the Provisional IRA was responsible for the Belfast bank robbery, the Taoiseach told the Dáil.
Mr Ahern also revealed that the release of the killers of Det Garda Jerry McCabe was "no longer on the table".
The Taoiseach said the IMC's report would be published later this week.
"The Government has seen it. If anything, it will go beyond anything I have said on previous occasions," he added.
"I think I will leave people to read it themselves."
On the possible release of the killers of Det Garda McCabe, Mr Ahern said: "That issue is off the table. I have heard people say in recent days that they made great efforts to do things to assist the peace process. Well, I did this one.
"I tried my best on this one, not only on the murder of Jerry McCabe but all of the other prisoners. I supported the release of several of the prisoners, including a number of people who murdered gardaí."
Mr Ahern added there had been a "demand" rather than an "offer" on the issue to try to secure a comprehensive agreement.
"That is off the table, and I do not see it coming back on the table either for that matter," he added.
Mr Ahern was replying to the Labour leader, Mr Pat Rabbitte, during leaders' questions.
Speaking later during the debate on a Fine Gael Private Member's motion, Mr Ahern said it was a measure of the Government's deep commitment to the peace process that it was prepared to consider the early release of the killers of Garda McCabe.
"This would have been in the context of a comprehensive agreement involving all the outstanding issues, including an end to all IRA paramilitary activity and the full decommissioning of their weapons," he added.
"This step was considered with the greatest of reluctance and only because it had become necessary if we were to conclude a comprehensive agreement. It was a risk that the Government were prepared to take in the particular circumstances of closure.
"However, I have now made it clear, including earlier today in the House, that the question of the early release of the killers of Det Garda McCabe is no longer on the table," the Taoiseach said.
