Nine people were taken to hospital - two in a serious condition - after a two car collision near Te Hoe in the Waikato.
The Waikato Westpac Rescue Helicopter and the Trustpower TECT Rescue Helicopter were dispatched to the scene of a car crash on Ohinewai Road around 4pm on Sunday.
St John and the Westpac Rescue Helicopter took nine people to Waikato Hospital - two in a serious condition, four with moderate injuries and three with minor injuries.
Police are investigating the cause of the crash.
There were also two fatal motorcycle crashes on Sunday.
Another person died after a van and motorbike crash in Waihau Bay in the Eastern Bay of Plenty.