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A darkly-clad robber waiting in a queue pushed a Sainsbury's Local worker before raiding the till and fleeing.
Police are hunting a man following the incident in Tonbridge Road, Maidstone, shortly before 10.30pm yesterday.
A spokesman for the force said: "After waiting in a queue of customers, he reportedly pushed a member of staff and stole cash from a till.
"He then ran off along an alleyway towards Elmstone Lane and Woodford Road."
The suspect was wearing black trainers, dark tracksuit bottoms, a black hooded top and a black facemask, police said.
Anyone who witnessed the incident or who has any information should call Kent Police on 01622 604100, quoting reference 46/9562/22.
You can also contact Crimestoppers anonymously by calling 0800 555111 or by using the online form on their website.