– Sgt Lynn McKevitt, Northumbria Police
"This is a serious collision which occurred in an area popular with dog walkers.
"We are really keen to speak to anyone who may have witnessed the incident or may have seen anyone leaving the car shortly afterwards.
"We would urge the people who were travelling in the car at the time to contact the police on 101 ext 69191."
A man who was hit by a car while walking his dogs has been transferred to Newcastle's Royal Victoria Infirmary.
Police say he has serious injuries and his condition is described as stable.
The occupants of the car, believed to be two men and two women, left the scene before police arrived.
One of the man's dogs, an 11-year-old golden retriever, was taken to a local vet for treatment for serious injuries.
Police are appealing for information after a collision between a car and a pedestrian in Sunderland.
It happened at 8:20am on today, November 4, at Riverside Park. Police say a burgundy Rover 75 collided with a 65-year-old man who was walking his dogs.
A 30-year-old man has been arrested in relation to the incident and is helping police with enquiries.