Two men wearing balaclavas and carrying sledgehammers stole £500 from a supermarket in St Neots.
At about 9.30pm yesterday (October 7), two men entered Morrisons in Bishops Road.
The pair demanded money from the tills and left with around £500 from a safe.
They made off with a third man in a red Ford Focus. Cambridgeshire Police have now launched an appeal for more information.
Detective Constable Lisa Bacon, from the Southern Acquisitive Crime Team, said: "We would like to hear from anyone who was in the area at the time and may have witnessed this incident or saw the vehicle in the moments leading up to and afterwards.
"We would particularly like to hear from anyone who has dashcam footage of the vehicle."
Anyone with information is asked to contact police online or call 101 and quote reference 35/73378/24
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here