CCTV of the collision is available here.
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Police in Sutton have released CCTV of a motorcycle rider they are seeking to trace after a man was injured in a road traffic collision.
The collision occurred shortly before 00:30hrs on Saturday, 28 February as the male pedestrian was crossing Malden Road at the junction with London Road, Sutton.
As the pedestrian crossed the road, traffic began to move off. A motorcycle then collided with the man, sending him careering down the road. The rider, who was knocked off his bike during the collision, is then seen to get up and angrily berate the stricken pedestrian before getting back on his motorcycle and driving off down Cheam Common Road.
As he makes off, a car which was waiting at traffic lights at Malden Road pursues the motorcycle down Cheam Common Road. Officers are also appealing to the occupants of that car to get in contact with officers as they may be able to assist the investigation.
The pedestrian, aged 53, was taken to a south London hospital for treatment to his injuries - has has since been discharged.
The motorcycle suffered some damage during the collision, losing a top box and mudguard.
Detective Sergeant Dave Jarvis of Sutton Police said:
"It would have been obvious to the rider of the motorcycle that the pedestrian he had collided with was seriously injured. To act in the way he did, shouting at the unconscious man and driving off from the scene without attempting to seek medical help, was a truly heartless act."
Anyone who witnessed this incident or has any information about the identity of the motorcycle rider, is asked to contact Sutton Police on 101 or contact Crimestoppers, anonymously, on 0800 555 111.
No arrests, enquiries continue.