Police are warning people to be vigilant after receiving information that counterfeit £20 notes could be in circulation in the Lancaster and Morecambe areas.
Shoppers and businesses are being urged to be extra vigilant when accepting £20 notes, or being asked to exchange them for smaller denominations.
Detective Sergeant Colin Forsythe said: “We were acting on information that counterfeit notes could be being used in the area.
“I appeal to shoppers and businesses to be extra vigilant when handling money and report anything suspicious to the police.”
Anyone with information can contact police on 101, alternatively, information can be passed to the independent charity, Crimestoppers on 0800 555 111.