Two women were running along Dock Road shortly after 8.10pm on Wednesday (8 November).
They were then in collision with a vehicle at the junction with Marshfoot Road and Old Dock Approach Road.
We also want to trace the driver of this car and speak to them as a witness.
[block_2]Detective Sergeant Steve Holmes said: “Two people have sustained really serious injuries as a result of this collision and it’s really important we’re able to find the driver involved.
“I know these images are not the clearest, but I hope releasing them will trigger someone’s memory.
[block_4]“I believe the impact of the collision will have left the car involved with damage to it and this would be visible.
“Has a neighbour returned home with damage to their car that wasn’t there in before?
“Have they parked their car differently to how they usually do?
