At around 11pm on the 4th November, a boy and girl, both 16, were punched and shoved by a teenager on a moped on Green Lane.
Police would like to speak to a young couple driving a red hatchback, as it’s reported they stopped to check the victims were okay.
The 17-year-old boy from Sunbury has been arrested on suspicion of common assault.
Any other witnesses are urged to contact police on 101.