Two men stole money from a Daventry shop after threatening staff with a screwdriver.
The robbery happened at the Tesco Express in Ashby Fields shortly before 6am yesterday (Sunday, September 30), when the men forced their way in through the front door.
A Northamptonshire Police spokeswoman said: "The suspects are described as white men wearing dark-coloured tracksuits.
"Their heads were covered with either jacket hoods or a hat and their faces were covered with a scarf or similar item."
The men threatened two members of staff with a screwdriver and made off with a quantity of cash from the tills.
Officers are appealing for witnesses and anyone with information is asked to contact Northamptonshire Police on 101.
Alternatively, they can call Crimestoppers anonymously on 0800 555111.