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Around £120 was snatched from the till of a Medway newsagents.
Police were called to Martin’s in Walderslade Village at 1pm on Saturday, August 8, following the incident.
The man is described as white, aged between 20 and 29, about 5ft 10in tall with short black hair. He was wearing a blue T-shirt and blue jeans.
Anyone who witnessed the incident or has information is asked to call police on 01634 792521.
Alternatively you can call Kent CrimeStoppers anonymously on 0800 555 111.