Officers are appealing for witnesses following an armed robbery in Huntingdon.
Two men entered Tesco Express, in Wertheim Way, at just after 10pm on Tuesday. One of the men threatened a member of staff with a knife before demanding money.
They took a large amount of cash in notes from the till and fled.
The man with the knife was described as wearing a dark tracksuit and grey trainers with a blue bucket hat, and the second man as wearing black trainers and a dark hoodie.
Anyone with information should call police on 101, quoting crime reference number 35/72178/19.