Whanganui Police want to hear from anyone who noticed anything unusual around Tinirau St early on Friday morning.
A man found unconscious on a Whanganui street has been taken to Wellington Hospital with critical head injuries.
Central District Police are investigating after the man was found with unexplained injuries at 3am on Friday on Tinirau St, Whanganui East.
Whanganui East resident Cara Davis was going home from Whanganui
Hospital about 3am and discovered the man on the road.
"I came round the corner into Tinirau St and saw a guy lying on the road unconscious," Davis said.
"I rang the police and ambulance but I was by myself so I didn't want to get out of the car. The police turned up pretty much straight away. They couldn't wake him and took him away in the ambulance.