Emergency services are at the scene of a serious crash involving a truck and a car on State Highway 2, Tauherenikau, South Wairarapa.
Police were called just before 12.40pm.
One person was initially trapped in a vehicle, and has been flown to hospital in a critical condition.
Diversions are in place.
The Serious Crash Unit will examine the scene.
Motorists are advised to avoid the area.
Issued by Police Media Centre