DETECTIVES investigating an alleged attack are trying to find further potential witnesses.

CCTV footage from about 2.50am on Saturday, April 29, shows three men on bikes ride along Middlesbrough's Marton Road from the direction of Longlands towards Borough Road.

They cycled in close proximity past a man and a woman on the same side of the road of them, opposite Stoneacre car dealership.

The driver of a yellow and black taxi is also captured on film, stopping after being flagged down by the same woman, and the driver appears to engage in a brief conversation with her before driving away.

The cyclists and the taxi driver are all urged to call police 101.

An 18-year-old woman suffered serious injuries in an alleged assault.

A 21-year-old man has been charged with attempted murder.