Police are hunting a white van driver following a hit and run in Milton Keynes on Friday.
The Ford Transit Connect style-van failed to stop after a collision with a motorcyclist on the roundabout between Old Wolverton Road and Stratford Road.
The 19-year-old victim was left with serious injuries and is being treated in hospital.
Officers believe it will have sustained damage to the rear offside following this collision at around 4.25pm.
PC Neil Stephenson said: “We are keen to hear from anyone who knows of a white van which has been damaged on the rear offside since being in Milton Keynes this afternoon.
“Or from anyone who may have witnessed this incident or may have some information which could help with our investigation into the collision which has left a man in a very serious condition in hospital.”
Anyone with information about this incident please call 101 quoting URN 986 25/3.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111.
No personal details are taken, information is not traced or recorded and you will not go to court.