A new row has broken out between Fianna Fáil and Fine Gael over alleged irregular voting in the Dáil.

Fianna Fáil has submitted a list of five Fine Gael ministers to a Dáil ethics committee in relation to eight separate voting incidents over the past 12 months.

Fianna Fáil claims Dáil footage suggests "clear instances" where ministers "may have been absent from the chamber or have got somebody else to vote for them".

The ministers have denied the Fianna Fáil claims that they were outside the Dáil chamber for votes.

In a statement, Fine Gael said: "Rather than respond to the issues of genuine public interest ... Fianna Fáil has spent the last four days trying to muddy the waters and distract from its failure to answer outstanding questions. When will Fianna Fáil explain the behaviour of its Deputies?"

Meanwhile, an investigation into the voting activity of some Fianna Fáil TDs in the Dáil last week will be completed and published by Thursday.

The report will also be debated in the Dáil that day and Taoiseach Leo Varadkar urged those named in it to contribute to the debate and to answer questions.

Ceann Comhairle Seán Ó Fearghaíl described the revelations that Niall Collins had voted six times for his absent colleague Timmy Dooley as "very grave".

He asked all concerned to co-operate with the investigation in a bid to restore public confidence in the voting system.

The events of last Thursday are also the subject of a complaint under the Ethics in Public Office Acts 1995 and 2001. This statutory inquiry will be carried out by the Oireachtas Committee on Procedure.

Mr Ó Fearghaíl said no person should be in any doubt about the seriousness of the situation.

He said this week's votes would only be taken when all TDs are seated in their designated seats.

Mr Ó Fearghaíl said any recommendations on changes to the Dáil electronic voting system that emerge from the review will be given immediate attention.

Independent TD Mattie McGrath has said that voting technology that can only be accessed by a TD's fingerprint must now be considered.

Green Party leader Eamon Ryan has said that he would also consider a fingerprint requirement for Dáil voting.

Meanwhile, Fianna Fáil leader Micheál Martin has put Dublin TD Jack Chambers temporarily in charge of the communications brief, after Timmy Dooley had to stand down from the frontbench over the controversy.

Mr Martin has also appointed another Dublin TD, Sean Haughey, to temporarily take over the foreign affairs brief, following Niall Collins also standing down from the frontbench.

Additional reporting Mícheál Lehane