A pillion passenger is seriously injured after a motorbike and car crash in Thornton Heath.
The motorcyclist failed to stop and was seen wheeling the motorbike away before police got to the scene in Beulah Road.
The crash happened at around 6.20pm on August 13.
Ambulance crews also attended and a 35-year-old pillion passenger was taken to a hospital in south London.
He remains there with serious injuries.
The driver of the white Renault Clio car stopped at the scene.
The Roads and Transport Policing Command want to speak with anyone who witnessed the crash, or who saw the rider with a damaged motorcycle.
They are also urging the rider to come forward and speak with them.
Anyone with information is asked to call the Serious Collision Investigation Unit on 020 8285 1574 or via 101 quoting reference CAD 6032/13Aug.
A Metropolitan Police spokesperson said: "Detectives are appealing for witnesses to a serious collision that occurred in Thornton Heath.
"Police were called at 18:20hrs on Saturday, 13 August to reports of a collision involving a motorcycle and a white Renault Clio on Beulah Road.
"Officers and the London Ambulance Service attended.
"The 35-year-old pillion passenger was taken to a south London hospital where he remains with serious injuries.
"The rider failed to stop and was seen wheeling the motorcycle away prior to police arrival.
"The driver stopped at the scene.
"Detectives from the Roads and Transport Policing Command are investigating.
"They would like to speak with anyone who witnessed the collision, or who saw the rider with a damaged motorcycle.
"They are also urging the rider to come forward and speak with them.
"Anyone with information is asked to call the Serious Collision Investigation Unit on 020 8285 1574 or via 101 quoting reference CAD 6032/13Aug."
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