Police at the scene last night (Image: Eddie Mitchell)
A would-be robber threatened staff and demanded money from them at a betting shop.
Police are investigating the attempted robbery at the Ladbrokes, Carden Avenue, Brighton, on Sunday evening.
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Officers descended on the shop after the incident which happened at around 7.30pm.
Four police cars were at the scene, including the police dogs unit.
A spokeswoman for Sussex Police said: "Detectives, investigating the incident, are following a number of lines of enquiry."
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