A MAN was knocked out in a violent street assault in the city last night.

Paramedics treated the 30-year-old man on George Street near Liverpool Street after he was attacked about 10.35pm.

“There’s been an assault outside World Square,” a NSW Police spokeswoman said.

Police rushed to the area which was crowded with mardi gras revellers.

The crowds forced the closure of the westbound bus lane as paramedics treated the man.

media_camera Those responsible for the attack escaped with police making no arrests.

The man’s distressed friends stood by as he lay knocked out on the footpath.

He was unconscious when he was stretchered into the ambulance and taken to St Vincents Hospital.

Those responsible for the attack escaped with police making no arrests.

City Central Police are investigating the incident.

More to follow.