Senior gardaí are expected to hand over a report on yesterday's riots in Dublin to Minister for Justice Michael McDowell tomorrow. 

They have been studying CCTV footage from across the capital, which contains images of rioting and looting.

Forty-two people were arrested yesterday and gardaí expect to make further arrests in the coming days.

Speaking earlier today, Minister McDowell said he accepted that gardaí had no advance knowledge that the rioting was planned. 

He added that there would not be a public inquiry but the force needed to learn from what happened.

Describing those responsible as thugs, Mr McDowell said they could not be allowed to decide who should exercise their civil liberties.

The violence erupted after protestors gathered in the city centre to demonstrate against the holding of a parade to commemorate the victims of republican violence.

Assistant Garda Commissioner, Al McHugh, has said garda intelligence did not indicate that a high grade counter-protest was going to take place on the scale that occurred.

Mr McHugh said many of those involved in the violence had been drinking in some pubs in Dublin city and used the opportunity to commit acts of random violence.

Thirteen of the 41 people arrested following the riots were charged with public order offences before a special sitting of Dublin District Court last night.

The defendants are aged between 17 and 30 and include two women.

One 20-year-old man has been charged with arson and causing €20,000 worth of damage to two cars.

Of the 13 people charged, 11 were released on bail and two were refused bail. The remaining 28 were released without charge.

Cost of damage

Meanwhile, retailers in Dublin city centre estimate the trading loss for businesses forced to close because of the rioting could cost millions of euro.

A number of retails premises were damaged and looted during the violence.

A spokesman for IBEC's Retail Ireland group said the rioting did not just affect businesses but also damaged the reputation of Dublin at home and abroad.

Aebhric McGibney of the Dublin Chamber of Commerce said retailers are counting the costs that could be up to €10m.

Protestors clash with gardaí

The trouble broke out just before 1pm at the junction of Parnell Street and O'Connell Street, near where the protestors had gathered.

The protestors clashed with gardaí in further skirmishes at O'Connell Bridge, Nassau Street, Aston Quay, Fleet Street and Temple Bar.

Fourteen people including six gardaí were admitted to hospital as a result of the disturbances.

O'Connell Street was cleared of debris and the road was re-opened by late yesterday afternoon although shop owners and the City Council are continuing to assess the damage, estimated to be in the region of €50,000.

Republican Sinn Féin, one of the organisers of protests against the Love Ulster march, placed the blame on the authorities for allowing the march to go ahead in the first place.

President Mary McAleese said the violence was unnecessary and 'totally unacceptable'.

The Taoiseach, Bertie Ahern, has blamed republican dissidents for starting the trouble, although he said they were quickly joined by local people.