Five teenagers have been arrested on suspicion of attempted murder after a stolen Mini Cooper was allegedly deliberately driven at people on bikes.
The car was involved in a hit-and-run after being driven into two boys riding a Sur-Ron electric motorbike at about 12:30 BST on Thursday on Teyfant Road in Bristol, Avon and Somerset Police said.
At about 17:30 BST the same day it was also seen following a 19-year-old man on a scrambler-type off-road bike along Fulford Road, before colliding with him on Hareclive Road.
The man was taken to hospital with facial injuries, while the two boys on the electric motorbike did not sustain serious injuries. All five suspects have been released on bail.
Insp Terry Murphy said: "We are keeping an open mind about this investigation and at this time we believe the incidents are linked and we're treating the collisions as a deliberate act."