Police are investigating the incident, which happened in Rolleston.
A teen is in a critical condition after he was found unresponsive while travelling in an overloaded car.
A police spokeswoman said officers were called to an incident in Rolleston, near Christchurch, about 1.20am on Sunday where a person was found unresponsive in a car.
Stuff understands the teen was travelling in an overloaded car when he became ill.
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“Others at the scene rendered medical attention and the man was transported by ambulance to Christchurch Hospital where he remains in intensive care,” the spokeswoman said.
An investigation into the incident is under way.