The chairman of the Smithwick Tribunal has requested a five-month extension of the deadline for submission of his final report.
Mr Justice Peter Smithwick said he was making the request because new lines of inquiry had opened up and of unanticipated matters that have emerged during evidence.
The tribunal is investigating claims of garda collusion with the IRA that led to the murder of two senior RUC officers, Chief Supt Harry Breen and Supt Bob Buchanan.
They were killed in an IRA ambush shortly after leaving a meeting in the station on 20 March 1989.
Earlier today, a retired detective inspector based in Dundalk told the tribunal it was possible there was an IRA mole operating within the station there.
Dan Prenty said: "You would have to think something very strange happened. I could not say positively there was collusion. I can't say there wasn't either."
However, he added that it is possible the leak could have come from the northern side of the border.
The former detective inspector said he believed the IRA had the ability to tap phones in Northern Ireland.
He also claimed that the IRA had tapped the phones of the officer commanding the British Military.
Three retired gardaí, Det Sgt Owen Corrigan, Finbarr Hickey and Leo Colton, are the focus of the tribunal and all three deny the claims of collusion.
The witness, who won a gold Scott Medal for bravery, described Mr Hickey as a poor garda with little interest in his job. He said he had no problems with Mr Colton.
However, he told the tribunal there were major issues with Mr Corrigan.
He said there was one incident when unarmed gardaí were seeking backup following a robbery, but Mr Corrigan did not answer his radio.
When he did, he took a long way round and as a result the raiders escaped into Northern Ireland.
The witness began disciplinary proceedings against Mr Corrigan as a result but nothing happened.
He also said Mr Corrigan had 'pirated' information from other colleagues and then passed it off as his own.
The retired detective inspector said he was also aware that Mr Corrigan did not have a driver's licence for ten years while he served as a garda and drove garda cars.
The witness also claimed there were a lot of people calling to the garda station looking for Mr Corrigan.
On one occasion he said the then Det Sergeant threatened to have a man deported when he came looking for payment and was backed up by a superintendent.
Mr Prenty said there was a person from a Chinese restaurant called to the station looking for payment for meals on several occasions.
Mr Corrigan had warned that he was not to be called when this person came in. Eventually, a garda got fed up, told Mr Corrigan there was someone to see him at reception but when he arrived down he saw the person from the restaurant.
"He abused the Chinaman. He told him not to call to the station and threatened he would have him sent back to China if he did," said the former Det Inspector.
The witness said he told the Superintendent what had happened and he said Mr Corrigan was right to say it.
Dundalk gardaí told to salute IRA units' coffins
Mr Prenty said that a former Chief Superintendent ordered gardaí in Dundalk to salute the coffins of the IRA active service unit killed in Gibraltar as they passed.
However, Mr Prenty, said the gardaí decided amongst themselves to ignore the order.
On the day, the witness said Chief Supt Owen Giblin was the only one who saluted the coffins. "He appeared in the papers and looked a rather sad sight," Mr Prenty told the Tribunal.
Four members of an IRA active service unit were killed by an SAS team in controversial circumstances in early 1988.
