Police are investigating after a man sustained critical head injuries following an assault in Manurewa, New Zealand last night.

Police received reports of disorder at the Backyard Bar on Great South Road around 3am this morning.

A large group were reported to be fighting and the victim was found unresponsive by Ambulance staff at the scene.  He was taken to Middlemore Hospital with serious injuries and has now been transferred to Auckland Hospital for further treatment.

A scene examination will be conducted today and an investigation is underway.  Police would like to hear anyone who has information regarding this incident.

Anyone who witnessed the incident or has information that may assist Police can contact Counties Manakau Police on (09) 261 1300 or report anonymously via Crimestoppers on 080 555 111.