Money, a quantity of cigarettes and alcohol were stolen from the business in Queens Road, Broadstairs, at around 7.40pm on Tuesday 9 March 2021, after staff were threatened with a knife.
The three suspects are described as men or teenage boys dressed in grey tracksuit bottoms and dark coats. They all wore face coverings.
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Anyone with information regarding the robbery, or dashcam or CCTV footage which may assist enquiries, should call Kent Police on 01843 222289, quoting 46/38629/21.
You can also contact the independent charity Crimestoppers anonymously on 0800 555111 or complete the online form at www.crimestoppers-uk.org