A young man has been arrested in connection with the investigation into the deaths of two men in Blanchardstown following a gun attack at a restaurant on Christmas Eve.
The 18-year-old is being questioned about suspected firearm offences.
He is being detained under section 30 of the Offences Against the State Act and can be held for up to three days.
He is being questioned at a garda station in west Dublin.
He is the fourth person to be arrested as part of the investigation.
Three other men have been charged and have appeared in court.
Gardaí said investigations are ongoing.
