Over 900 gardaí have been assigned to police the border region for the forthcoming G8 summit.

US President Barack Obama and Russian President Vladimir Putin are among world leaders attending the summit to be held at the Lough Erne golf resort in Co Fermanagh later this month.

Special courts will be provided if necessary and district court judges are on standby.

A custody management plan for the region is in place.

Gardaí have said they are aware of potential threats from militant protesters and dissident republicans.

A garda spokesman said that while there are no plans for road closures or diversions, those living and travelling in the areas of south Donegal, Leitrim, Cavan and Monaghan in particular may face delays with security checks on roads leading to the Lough Erne site.

Assistant Garda Commissioner Kieran Kenny said: "Everyone has the right to peaceful protest, in line with the Human Rights Act, An Garda Síochána will act appropriately to ensure that there is no unnecessary disruption caused to the public by such protest."

Gardaí will publish a breakdown of the cost of the operation after the summit has concluded.

A number of the delegations are being accommodated south of the border.

US First Lady Michelle Obama and her two daughters are due to visit Dublin and attend a number of events.

However, the family are not expected to visit Moneygall in Co Offaly, where Mr Obama's ancestors came from.

Meanwhile, security has been stepped up at Belfast International Airport, where world leaders will arrive for the summit.

PSNI Chief Superintendent Henry Irvine said security around the airport will intensify ahead of the start of the summit on 17 June and "the visible police presence will increase further".

Vehicle checkpoints, searches and other security-related duties will be carried out by officers.

Chief Supt Irvine also predicted potential delays for those travelling through the Antrim, Crumlin, Templepatrick, Killead or Aldergrove areas between 14 and 19 June.

As part of the huge security operation around the high profile event, an 8km stretch of Fermanagh's Lough Erne is being closed down completely for three days.

About 3,600 officers from Britain will be travelling to Northern Ireland to support 5,000 PSNI officers on G8 deployment.

Among them are boat crew members that patrolled the London Olympics venues.