Police believe that two men who held up a shop in Billingshurst at gunpoint made their getaway in a silver car.
The duo, armed with handguns, walked into the rear of Budgens store on Tuesday and forced staff into a room before stealing money from the safe.
A silver car driven by a third man was seen to pull away. The car was waiting in Coombe Hill - a one-way street leading to the High Street.
The men were described as wearing dark coloured overalls or trousers. One wore a balaclava and the other a dark coloured motorcycle crash helmet.
Anyone who saw the car or has any information, should call Detective Sergeant Kevin Fitzgerald at Horsham CID on 0845 6070999.
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