An investigation has been launched following a serious assault Phibsborough Road in Dublin, shortly after 7 o'clock in the evening on Monday 7 October.
A man in his 40s received serious head injuries and was brought to the Mater Hospital. He has since been transferred to Beaumont Hospital, where his condition is described as critical.
Gardaí are appealing for anyone who was in the Phibsborough Road area between 6pm and 7pm that evening who may have witnesses the assault to contact them at Mountjoy Garda Station on 01-6668600, or the Garda Confidential Line on 1800-666-111.
They are also appealing for motorists who may have passed through that area around that time and who have dash cam footage to contact them.
No arrests have been made in relation to the assault, and investigations are ongoing.