POLICE are warning shopkeepers to be aware of a fraud known as "ringing the changes" after a recent incident in Wadebridge.
Two men of Asian or Eastern European appearance are being sought after defrauding store owners in a number of towns in Cornwall.
Police say the pair struck at a convenience store in Wadebridge on Wednesday, February 19, when they bought an item of low value.
The men entered the shop with a number of £20 notes and asked the staff member to change them into £10 notes.
As the cashier started to do this, the male asked for them to be in different notes, but the transaction was aborted and the men were asked to leave the shop.
The male became very insistent that the cashier complete the money exchange and initially refused to leave the shop, police said.
Sergeant Robin Moorcroft, from Wadebridge police, is warning shopkeepers to be "vigilant" and report anything suspicious as quickly as possible.
"Should you see any suspicious individuals in your premises, particularly individuals attempting to 'ring the changes', please call 999 for police attendance," he said. "It would be helpful to have a description of the individuals and any vehicle they use."