One person has died and another is in a critical condition following a crash at Fernside in the Waimakariri District.
One person died at the scene and another received serious injuries, a police spokesperson said.
A St John spokesman said one person was flown to Christchurch Hospital in a critical condition via helicopter.
Stuff reported it was a young boy that died in the crash and his father has been badly burned, with burns covering more than two thirds of his body.
Police are now investigating the circumstances around the accident.