Thieves stole large amounts of cash in three supermarket robberies in Northamptonshire during Thursday night and Friday morning.
The Tesco Express in Bordeaux Close, Duston, was broken into at about 1.10am on Friday.
Three people broke into the shop, damaged the express checkout till and stole a large amount of money.
They were all wearing dark clothing and balaclavas and one was carrying a sledgehammer with a yellow handle.
Earlier, at about 11.30pm on Thursday night, a gang smashed the window of Marks & Spencer Simply Food in London Road, Wellingborough, damaged four self service checkouts and stole a large amount of money. They left the scene in a black BMW 1 Series.
Also in Wellingborough, at about 1.40am on Friday, the Tesco Express in Queensway, Wellingborough was broken into by three men using crowbars and a sledgehammer with a yellow handle.
Once inside, they damaged a self service checkout and stole a large amount of money.
Witnesses or anyone with information can call Northamptonshire Police on 101 or Crimestoppers on 0800 555111.