Six people were hospitalised in a crash between two cars and a stock truck on State Highway 29 near Maungatapu.
The crash happened about 7pm yesterday.
Sergeant Wayne Hunter said a car and a stock truck had collided on the highway between the Maungatapu Bridge and the Maungatapu roundabout. A second car was then in a collision with the first car.
The stock truck was empty because it had recently been unloaded.
Mr Hunter said two of the five occupants of the first car and the lone occupant of the second car were trapped in their vehicles.