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A 25-year-old was robbed of his mobile phone in broad daylight on Monday.
The victim was punched in the face during the incident, which took place a 2.25pm alongside the River Medway in Hart Street.
Detectives have released a computer generated image of a man they would like to speak to.
He is believed to be approximately 5ft 8in tall, with a southern accent.
Anyone with any information is asked to contact Detective Constable Simon Powell on 01622 604188, quoting crime reference YY/22819/14.
Alternatively contact Kent Crimestoppers, anonymously, on 0800 555 111