Police are appealing to the public for information to help find a man who they say was involved in an early-morning Christchurch assault.
Detective Senior Sergeant Nicola Reeves said a man punched another man in an unprovoked attack on Sunday, causing the victim to fall to the ground and hit his head on the pavement.
"The victim became unconscious and was transported to hospital where he remains," Reeves said.
The assault happened on Christchurch's Oxford Terrace at 1am.