Gardaí have started a murder investigation after a 21-year old man from Neilstown was shot dead overnight in west Dublin.

Responding to reports of a shooting at Harelawn Green, officers discovered a man with multiple gunshot wounds to the head and body at 12.20am

The victim, who has been named locally as Dean Johnson, was taken to Tallaght Hospital where he died 30 minutes later.

A car discovered on fire at Collinstown Crescent 1km away from the shooting is believed to have been used in the attack.

Gardaí are particularly interested in the movements of the black Vauxhall Vectra with tinted windows, registration number 99-DL-7997.

Three men were seen leaving the vehicle before it was set on fire. 

Gardaí have already spoken to a number of witnesses and have appealed for anyone else with information to come forward.

Anyone who was in the Harelawn Green or Collinstown Crescent areas last night or early this morning is asked to contact Ronanstown Garda Station on 01-666 7700.