Two people have been arrested following a series of armed robberies across Horsham, Crawley and Mid Sussex.
Police said £10,000 was stolen from the Co-op store in Cowfold on April 30 after it was targeted by an armed robber.
Another Co-op store in Bolnore Village and Premier Convenience store in Three Bridges were also targeted on April 9 and 29 respectively.
Staff were left shaken in all three incidents but no-one was injured, officers added.
Police said a 33-year-old man and a 29-year-old woman, both from Crawley, have been arrested on suspicion of robbery.
They remain in police custody whilst enquiries continue.
Anyone with any information is asked to contact police at www.sussex.police.uk/contact-us/response-to-appeal/ or call 101 quoting Operation Bourbon.
Alternatively you can contact the independent charity Crimestoppers anonymously via https://crimestoppers-uk.org/ on 0800 555 111.
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