Gardai in Dublin are investigating an assault in the city centre on St. Patrick's Day which was captured on camera.

The video shows a young man being kicked in the head and in the face in broad daylight. It has since gone viral online.

The footage shows witnesses screaming as the attack takes place with revellers running into the street to help the victim.

The perpetrators, of which there appear to be at least two, run away as people attend to the victim.

Local councillor Nial Ring says he is heartened by the revulsion that has been expressed on social media.