Three people remain in garda custody in Dublin following what's believed to be the first gangland murder of the year.
The Justice Minister has condemned the shooting in Drimnagh, describing it as "completely unacceptable."
The 20-year-old victim of this gun attack, that happened on Knocknarea Road in Drimnagh, has been named locally as Josh Itseli.
He died at the scene in the early hours of Monday morning after being shot a number of times.
A Mercedes Benz and a Volkswagen Golf were discovered crashed, while a number of other vehicles were damaged.
A silver Ford Focus found nearby has been identified as a vehicle of interest.
Gardaí also found a suspected pipe bomb at Knocknarea Court, which had to be made safe by the Army Explosive Ordnance Disposal team.
Armed officers arrested two men, and a teenage boy, shortly after the shooting. They remain in Garda custody.
Superintendent Paul Maher, says investigating officers are appealing to anyone with dashcam footage of the area around the time of the shooting to make it available to Gardaí.
"An Garda Síochána are appealing for any person with CCTV footage in the wider area of Cooley Road, Brandon Road, Errigal Gardens, Crumlin Road, Slievenamon Road, Mourne Road and associated side roads and who were in the Knocknarea Road area between 11.30pm on Sunday night and 12.30pm on Monday to make any footage available".
An incident room has been set up at Sundrive Road Garda Station. Gardaí are appealing for witnesses to contact Sundrive Road on 01 666 6600, or the or the Garda Confidential Line on 1800 666 111.