Detectives investigating the murder of drug dealer Noel Roche in the north Dublin suburb of Clontarf on Tuesday have arrested a man in connection with the shooting.
There are unconfirmed reports that the man may have escaped the attack in which Mr Roche was shot dead.
It is understood the man was arrested in the city centre this afternoon after turning himself in to gardai.
He is being detained at Raheny Garda Station under Section 30 of the Offences Against the State Act.
A man is known to have fled the attack on the Clontarf Road outside the Yacht pub at 10.30 on Tuesday night after the assailants pulled up beside the car he was driving and discharged four shots.
Mr Roche who was a front-seat passenger died at the scene.
Earlier Superintendent Nicholas Conneely said people had come forward with information but as yet there had been no witnesses to the shooting.
A Peugeot car found in the nearby Killester area from which two people were seen fleeing just four minutes after the attack has not as yet provided any leads.
Both men were known to be involved in the four-year feud between two southside drug gangs but a definitive link to the ongoing feud has not been established.