A man pushed and threatened newsagents' staff saying he had a gun in a robbery.
Police are seeking witnesses after the robbery this morning.
At 8.05am a man entered Martins newsagents in Tilgate Parade, Crawley, threatened and pushed the member of staff and took a quantity of cash, believed to be less than £100, from the safe before making off on foot.
The man said he had a gun, but one was not seen.
He is described as white, about 5'10" and of medium build. He was wearing a black hoody up, with white stripes down the arms and a Nike emblem on the front, a pale pink scarf covering his mouth and nose, long grey jogging bottoms and dark coloured trainers with a white sole.
The member of staff was shaken but not physically injured.
A police helicopter was called in to help officers search the area but the man was not found.
Detective Sergeant Mark Miller said: "If you were in the area around Tilgate Parade and saw anything that might help our investigation, please contact us online or by calling 101, quoting serial 375 of 21/07.
"You can also contact the independent charity Crimestoppers anonymously on 0800 555 111."
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