You are not permitted to download, save or email this image. Visit image gallery to purchase the image.
Emergency services attended the crash at the intersection of Rockdale Rd and Scott St at about 9:50am, a police spokesman said.
A St John spokesman said two patients were taken to Southland hospital with moderate injuries.
Ambulance officers also assessed and treated two patients with minor injuries at the scene.
The crash involved two cars and a truck, he said.