A 30-year-old man remains in a critical condition after being kicked off his bike by another cyclist and crashing into a car.
The victim was cycling on Wallis Road, Hackney Wick, east London, at about 12.45pm on 10 March when another man caught him up and began to ride alongside him.
Scotland Yard said his attacker then kicked the victim off his bike before cycling away in the direction of Berkshire Road. The victim was taken by ambulance to an east London hospital.
The motive for the attack is not known, according to the police, who released CCTV images of the incident on Monday.
The suspect is described as a white male in his 20s or 30s. Police also want to hear from anyone who may have been threatened or assaulted by him in and around Hackney.
Officers are asking anyone who saw the incident to call Central East CID via 101 quoting CAD reference 3718/10MAR19.