A teenager is in hospital with serious injuries after falling from the roof of a car while it was being driven.
Warwickshire Police said they believe the 18-year-old was lying on a Fiat Punto which was being driven by a woman with female passengers on board.
He suffered serious head injuries in the incident on private land in Chesterton, Warks, on Tuesday.
An 18-year-old woman from Southam has been arrested on suspicion of causing serious injury by dangerous driving.
She has since been released on police bail, a spokesman said.
The injured teenager was taken to Warwick Hospital before being transferred to the neurological unit at the University Hospital, Coventry.
Police investigating the incident are appealing for witnesses and would like to hear from anyone with information who has not already come forward.