Kent Police is appealing for witnesses to a reported assault near Dover Priory railway station.
The incident on Folkestone Road happened between 3pm and 3.30pm on Friday 21 April 2017.
It was reported that a man in his 50s was walking on the bridge crossing the railway line when he was approached by three young men riding bicycles.
One of the men is alleged to have punched the victim in the face before cycling away in the direction of St John’s Road.
Anyone who witnessed the incident is urged to call the appeal line on 01843 222289 quoting reference ZY/15884/17. Alternatively call Kent Crimestoppers anonymously on 0800 555111.