Latest: Noirín O’Sullivan to tell Oireachtas she fears falsification may not be confined to traffic data

The statement, which has been seen by the Irish Examiner, will include an apology from the under-fire commissioner for the "grave mistakes and wrongdoing" which have taken place and seen almost one million drink driving tests made up and almost 15,000 people wrongly convicted for road traffic offences.

However, despite saying she "sincerely" apologises for the scandal, Ms O’Sullivan will again give no indication she is considering her position amid the latest political crisis to hit the force.

"I sincerely apologise for the grave mistakes and wrongdoing during the last decade that have led to the two controversies we are here to discuss. My fear, and my real fear, is that this falsification is not confined to traffic data.

"Those mistakes and wrongdoings are unacceptable in policing terms, unacceptable in ethical terms, unacceptable in terms of public trust, and most critically unacceptable to the advocacy and support groups involved in road safety and to those who were wrongly brought to court.

"They have raised serious issues about how we managed the service, how certain gardai operated on the ground, and their supervision.

"Given the scale of these issues, they can’t simply be blamed on one individual or one area. It is a collective failure, from top down to bottom up," she will say.

While Ms O’Sullivan is due to be public grilled on the issue by the justice committee on Thursday morning, members have been warned they must limit their questions solely to the current scandal and not the litany of other issues affecting the force.

Update 2.04pm:Crisis-hit garda commissioner Noirín O’Sullivan is facing the prospect of two public grillings over a series of scandals under her watch within days after a second Dáil committee said it wants to speak with her about incidents in the force, writes political correspondent Fiachra Ó Cionnaith.

The cross-party Dáil public accounts committee confirmed this afternoon it is seeking a meeting with Ms O’Sullivan over the report into serious garda college financial irregularities.

The request comes after the cross-party Dáil justice committee contacted Ms O’Sullivan on Monday ordering her to attend a public meeting on Thursday morning over the separate phantom drink driving tests scandal.

While Sinn Féin, Labour and Solidarity-People Before Profit have all called on Ms O’Sullivan to step down due to the repeated scandals under her watch, she continues to retain the confidence of Government.

Fianna Fáil has said it can no longer support the garda commissioner, but has crucially stopped short of backing any Dáil no confidence motion which would effectively force cabinet to act.

Earlier:The Dáil has heard further calls for the Garda Commissioner to be sacked.

Noirín O’Sullivan remains under pressure over the one million fake breath tests and 14,700 cases of people being wrongly convicted in court for speeding.

And another report is set to outline financial irregularities at the Garda training college in Templemore.

Independents 4 Change TD Mick Wallace said he cannot believe the Commissioner is still in a job.

“Minister, there is mayhem,” Mr Wallace said today. “The force is in bits, it is falling down around her ears and the only one supporting her is you, your government.

“When is this going to change?”