A police officer and an off road biker were both injured in a collision on Eastmoor.
The incident happened on Kilnsey Road, at 6.50pm on Tuesday.
The biker suffered chest and facial injuries and the police officer suffered minor injuries.
The incident has now been referred to the Independent Police Complaints Commission (IPCC).
An IPCC spokesman said: “We have received a referral and we are assessing it to see if there needs to be any IPCC involvement.”