A primary school camp ended badly when three children and a parent were transported to Waikato Hospital today.
The car they were in collided with another vehicle outside Pokuru School, near Te Awamutu.
A number of vehicles were returning children to the school after a week-long camp near Lake Taupo.
The driver of the second car was uninjured.
An air ambulance transported one young girl to hospital. She is described as being in a serious condition.