Two vehicles were involved in the crash, which occurred near the Maramarua Golf Club.
“Two people are in a critical condition, with a third person in a serious condition.
Those in critical condition are due to be airlifted to hospital.”
A spokesman said the Auckland Westpac Rescue Helicopter and Waikato Westpac Rescue Helicopter were sent to Maramarua about 4.30pm to assist multiple patients trapped in a car versus campervan accident.
The Auckland helicopter “flew a female patient (age unknown) to Waikato Hospital in a critical condition”.