A teenager has died and a 16-year-old boy is critically ill in hospital after a car smashed into a viaduct while being followed by a police patrol.
Warwickshire Police said the Toyota Carina struck a pillar of the bridge in Rugby shortly after an officer investigating a report of a car-jacking started to track the vehicle.
An 18-year-old man at the wheel of the Toyota suffered a serious head injury and was pronounced dead shortly after his arrival at Coventry's University Hospital.
His 16-year-old passenger sustained pelvic and leg injuries in the crash at Butlers Leap, Rugby, and is in a critical condition in the same hospital.
A police spokesman said the crash happened shortly after a food delivery worker was pushed away from his Toyota car by two males who made off in the vehicle.
"Shortly before 1.30am, a police officer who was on duty in the area following a report of a robbery, saw a red Toyota Carina with two males on board which he suspected might have been involved in the robbery," the spokesman said.
"The officer, who was driving a marked vehicle, started to follow the Toyota.
"For reasons which are not clear, after a very short time the Toyota collided with the central pillar of the viaduct at Butlers Leap.
"No other vehicles were involved."
Anyone with information about the crash, which has been referred the incident to the Independent Police Complaints Commission, is asked to contact Warwickshire Police on 01926 415000 or the Crimestoppers hotline on 0800 555111.
