Five people were threatened by armed robbers thought to be linked to a series of raids in Norfolk and Cambs.
Three men, wearing balaclavas and carrying guns and a metal bar, carried out an early-morning raid at Weeting Bowls Club near Thetford, Norfolk.
Police said no guns were fired and no-one was hurt, but a quantity of cash was taken by the gang, who were driven away by a fourth man.
Officers have linked the incident to six other robberies since 10 September.
Det Insp Mark Beresford said: "The Weeting robbery bears a number of similarities to the earlier cases and is being linked at this time.
"While two of the men brandished shotguns, no firearms were discharged and thankfully no-one was injured, although this was obviously a frightening incident for those involved."
Armed police and other units were sent to the bowls club, but the vehicle used in the raid has not yet been found.
Mr Beresford said his team was "working flat out to capture those involved" but he appealed for people to be vigilant and to report to police any information they may have.
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