A cyclist suffered serious head injuries in a hit and run collision with a motorcycle on an Oxford estate, police have said.
Police are appealing for witnesses after the crash on Knights Road, Blackbird Leys, at 2.30pm yesterday.
A 43-year-old female cyclist was taken to the John Radcliffe Hospital with head injuries. Her condition is not known.
The rider of the dark coloured motorcycle failed to stop at the scene.
Anyone with information should call police on 08458 505505 or Crimestoppers on 0800 555111.