Gardaí are questioning three teenagers in connection with the fatal shooting of Paul McCarthy in Dublin yesterday.
The 19-year-old died after he was shot in the head at a house in Inchicore.
Three 19-year-old men presented themselves at Kilmainham Garda station at 7.30pm this evening.
They are now being detained under Section 50 of the Criminal Justice Act and can be questioned for up to a week.
Mr McCarthy was in a back room with a number of other people when he was shot once in the head with a handgun.
Detectives say they are investigating the possibility that his death may have been accidental and that a number of young men were handling a loaded handgun.
A gun was dropped nearby at the junction of Emmet Road and gardaí now say they have what they believe is the weapon used in the shooting.
Gardaí at Kilmainham have begun a murder inquiry and have appealed for witnesses or anyone with information to contact them.
Mr McCarthy was known to gardaí. He was arrested last February after they seized €30,000 worth of cocaine, a Glock pistol and a loaded magazine.
He appeared in court last Wednesday charged with drugs offences.
