At around 5.30pm on Tuesday 22 June 2021, a man in his 20s was washing his hands in the public toilets in Canterbury Lane when he was approached by a man who demanded his mobile phone.
It is reported the suspect may have been holding a knife or bladed item.
The victim managed to defend himself and leave the toilet, seeking help at a nearby shop and reporting the incident to police.
Officers attended the area and have begun making enquiries. No arrests have been made.
Detectives would like to speak to a man seen in the area at the time of the offence, described as white, aged between 30 and 40 years old with brown facial stubble. He wore a navy baseball cap and a brown thin jacket.
Anyone with information regarding the attempted robbery should call Kent Police on 01843 222289 quoting 46/108198/21.
You can also contact the independent charity Crimestoppers anonymously on 0800 555111 or by using their online form at www.crimestoppers-uk.org.