A masked raider threatened shop assistants at a food store in Brighton with a 6in carving knife.
He burst into Spar in Lewes Road at 7.30pm yesterday and grabbed cash from the till.
Staff were shocked but unhurt.
The offender, who was black and in his early 20s, had a stocking over his face.
He wore black trousers, a black bomber jacket and a black baseball cap.
Witnesses should call PC Alex Campbell on 0845 6070999.
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