A man armed with a knife held up staff at an off-licence and fled with a small amount of cash and cigarettes.
Police are appealing for witnesses to the robbery at Threshers, in The Street, Rustington, at about 7pm on Sunday.
The robber is described as in his 30s, about 5ft 5in, slim with short dark brown hair, clean shaven and with a weathered complexion.
He was wearing a black jacket, blue top, dark blue jeans and white trainers.
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