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.

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Police are investigating the incident. Photo / Graeme Russell
Police are investigating the incident. Photo / Graeme Russell