The inquiry into the Dublin and Monaghan bombings is expected to seek a further extension, possibly for six weeks, to complete its work, according to Taoiseach Bertie Ahern.
Mr Ahern said senior counsel Patrick MacEntee had met officials from his department and indicated that he would seek another extension for the inquiry, which was due for completion by Tuesday.
Mr MacEntee had completed his investigative work and "has received quite a lot of co-operation and has followed a lot of new lines".
Mr Ahern said: "I am informed by British sources and by the Secretary of State that there has been quite an engagement on these issues."
He added that "how the information Mr MacEntee has got can be legally used is the issue".
The investigation had cost €1,822,266, of which €1,155,223 was spent on legal costs with €667,043 going towards cost of support staff and administrative costs. "The costs are well below those associated with a tribunal of inquiry."
