A teenager is in a life threatening condition in hospital after being thrown from a trial bike in Parson Cross this morning.
The accident happened on Buchanan Road at around 12.30am between the junctions of Collinson Road and Adlington Road.
Two 19 year old men were on the 125cc bike when the rider is believed to have lost control when he was travelling towards an oncoming police car.
One of the men sustained life threatening injuries and is currently in a critical condition in hospital.
The second man sustained minor injuries and was arrested on suspicion of dangerous driving and theft of motor vehicle.
South Yorkshire Police’s professional standards department and the IPCC have been informed.
Witnesses should call 101 or Crimestoppers.