At around 2.47pm on Monday 7 June, officers responded to a collision between a pedestrian and a car on Tickhill Road, Balby.
A 72-year-old man was taken to hospital with arm and head injuries. He remains in hospital.
As emergency services were responding to this incident, another vehicle was in collision with a police officer at the scene at the junction with Alverley Lane.
The 22-year-old police officer was taken to hospital with arm and leg injuries. He has since been discharged.
The driver of the vehicle, a 34-year-old man, was arrested on suspicion of being over a drug drive limit and being unfit to drive through drink or drugs.
He has since been released under investigation whilst enquiries continue.
Acting Police Sergeant Martyn Micklethwaite from our Roads Policing Group said: “We are really keen to hear from anyone who saw what happened on Monday afternoon, or captured either collision on dashcam or CCTV footage.
“If you think you can help with our enquiries, then please contact us via 101 or submit a report online via our new reporting portal.
“You can also send dashcam footage to firstname.lastname@example.org – make sure you quote incident number 527 of 7 June in the subject line.”
For the latest information visit: https://www.southyorks.police.uk/