The Garda Commissioner has insisted An Garda Síochána is "ready" for Brexit but at this stage he does not know "what type of Brexit we'll get".

He said the force was going to "hold off" on reorganising the border divisions as part of the new policing plan because of the "uncertainty" of Brexit and wait and see what develops first, before reducing the border divisions from four to two.

He said he would "not speculate" on what the Border infrastructure will be but he would foresee continuing focussed operations co-operating with the PSNI against cross border smuggling, rural and organised crime.

He also said there had been an increase in dissident republican activity with six national security attacks in Northern Ireland so far this year and the gardaí are dealing with responses, support and the investigation of these groups.

He said that major issues would arise because of Brexit, that EU treaties in relation to organised crime, the tracing of financial assets and the use of the European Arrest Warrant would all "fall away" and the garda when working with UK law enforcement would "have to fall back on more complex processes".

Commissioner Harris said there were about 30 gardaí now trained for the new border Armed Support Unit in Cavan and that there had been "a big uplift in capability" with more to come with the graduation of new gardaí in November.

The Commissioner said he was well aware of the challenges of Brexit and that he was also looking at the National Units, the Garda Economic Crime Bureau and the Criminal Assets Bureau in relation to the confiscation of assets.

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Earlier, Commissioner Harris has said the current "burdensome" structure is holding gardaí back from providing the best possible police service.

Drew Harris told the Oireachtas Justice Committee that his new operating and structural model will put more gardaí on the street.

He also said that gardaí had been assigned to stations in Tipperary and Kilkenny that have not had a garda for years along with the six closed stations that had been reopened.

He said that new garda clinics would be set up in vacant stores and offices.

Commissioner Harris said more than half of all gardaí will under the new operating model be devoted to community policing.

Chief Superintendents will, he says, have more freedom to make individual policing decisions for their area but will be subject to a standard overall corporate supervisory model.

Superintendents he said will be freed up to get from behind their desks and interact with their local community and as will sergeants and inspectors.

The new model he insists will have major benefits for victims who will see their crime investigated quicker and in the case of specialist crimes by investigators well trained in this area.

Commissioner Harris said the model will deliver a community-based community focused policing service.

He cited the recent permanent allocations of gardai to areas such as Emly and Toomevara in Tipperary and Ballyhale and Stoneyford in Kilkenny, stations which have had no garda for a number of years.

The Commissioner also said the garda planned to open garda clinics in vacant stores and in offices to meet with local communities, roll out new mobile phones for front line officers before the end of the year and procure a new garda uniform.

Assistant Commissioner Michael Finn told the Committee that the new operational policing model has put an additional 480 gardaí back on the streets in the last two years.

The Assistant Commissioner also said they plan to be able to release another 1,000 gardaí for front line duties, as they move from a district to a divisional policing model.