Police investigating serious assault which left one person critically injured in Christchurch

The incident took place on Hereford St in central Christchurch. Photo / File

A serious assault in Christchurch CBD has left a person fighting for their life in hospital.

A senior sergeant at the scene says the attack happened on Hereford St at 4.40 this afternoon.

Police are making inquiries into the circumstances of the assault.

An eyewitness says there's still a police presence in the area near the Christchurch City Mission.

Police are investigating the incident. Photo / Graeme Russell