A video filmed by a spectator shows a physical altercation in Dublin City Centre between a group of four approaching a lone man, who appeared to drop two of them unconscious.
The brief clip, which has been forwarded across social media, shows four men approaching another man on Talbot Street. One of the group, clad in a brightly coloured t-shirt, edges close to the man.
This man steps to the right and throws a punch with his right hand which knocks the other man to the ground
