Three teenagers were taken to hospital after a suspected stolen moped they were riding collided with a police car.
The boys, aged between 14 and 16, were on the moped when it collided with a Greater Manchester Police (GMP) vehicle in Broadoak Park in Wythenshawe, Manchester, at about 15:45 BST on Monday.
The boys were arrested on suspicion of going equipped for theft, and theft of a motor vehicle.
Two of them remain in hospital for treatment, a GMP spokesman said, adding the force’s professional standards department had made a referral to the Independent Office for Police Conduct.