A police communication spokeswoman also said it was not known how long this stretch of highway will be closed.
A tweet from the Transport Agency said a detour was in place.
St John Ambulance also attended the incident and transported the two patients to Tauranga Hospital.
Further south, a person has died after the car they were in collided with a power pole in Otaki, around 7.15pm yesterday.
A rescue helicopter was dispatched to the scene, but the person died on the way to hospital.
The patient was the only person in the vehicle.
The serious crash unit is investigating.