The suspect being quizzed over the stabbing a 19-year-old who is fighting for his life was brought to the garda station by a close relative in the hours after the attack, the Irish Mirror can reveal.
The victim was knifed in the neck while in the driver's seat of his black Audi car in Swords, north Co Dublin on Thursday night at around 7pm.
He was rushed to Beaumont Hospital where he remains gravely ill and his family are keeping vigil at his bedside.
