A police officer who was trying to stop a stolen vehicle with four teenagers inside was injured when his patrol car was repeatedly rammed by the group.
The Auckland officer was working with his colleague overnight when the incident occurred in Grey Lynn.
The two officers, who had been co-ordinating with the police dog unit, had tracked the vehicle following an earlier incident of aggravated robbery in the city.
The pair were planning to use road spikes but were unable to set them before the vehicle arrived.
Police said the fleeing vehicle was being driven at speed and directly at one of the officers, who quickly returned to his patrol car.