Gardaí are investigating whether the doorman of a pub in Fairview in Dublin was targeted by the gunman who opened fire early this morning.
The lone gunman - brandishing two handguns - confronted the bouncer at the Players Lounge in Fairview at around 12.30am,
He chased him into the bar before shooting him in the head.
The doorman is in a critical condition at Beaumont Hospital.
Two others were wounded in the attack and are being treated at the Mater Hospital.
One man was shot in the chest and is in a critical condition. Another man is being treated for serious injures.
The road close to the scene of the shooting has been closed off.
Motorists are advised that there is no through road from Fairview to Richmond Road and from Philipsburgh Avenue to Fairview Strand until about midday