A youth (17) from Co Wexford is facing extradition to Britain over the rape of three girls at a horse fair in England last year.
The youth, from Crory, Ferns, Co Wexford, was arrested by gardai under a European Arrest Warrant.
Extradition proceedings are now due to get under way.
Police in Appleby, Cumbria, want to question the teenager over the brutal attacks on three young girls on June 5, 2005.
Two 14-year-old girls and one aged 13 who were visiting Appleby Horse Fair were raped in broad daylight in a secluded area of the town's Belgravia estate.
Cumbria Police believe four youths took part in the attack and a fifth is believed to have watched as the girls were raped.
The historic Appleby Horse Fair attracts thousands of visitors from all over Ireland and the UK every year.
The girls, believed to be from Co Durham, contacted police after the fair and an investigation has been under way since then.
Following an appeal on the BBC's Crimewatchprogramme in June this year, detectives received more than 100 calls with information.