A masked man threatened staff at a bookmakers in Buckinghamshire with a handgun during a robbery.
The robber pointed the gun at staff working at Coral bookmakers in Aylesbury town centre while ordering them to hand over cash.
He escaped from the bookmakers on Monday night with what police have described as a "quantity of cash" in a bag.
The robber was wearing dark sports clothing when the hold-up took place.
Anyone with information about the robbery, which took place between just after 2000 GMT, is asked to contact Buckinghamshire Police.
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