A petrol station cashier was punched by a man who asked for cigarettes, then demanded cash from the till.
The cashier was working in the Shell Garage at Broadbridge Heath, near Horsham.
The thief stole money from the till before running off towards Horsham town centre after the raid on Friday at 6pm.
The attacker is described as white, 30 to 40, around 5ft 11in, of medium build and with short dark hair.
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