Online sellers are being urged to be cautious of counterfeit notes currently circulating around the north and north-east. .
Officers are asking people to be vigilant following reports £50 notes are being used.
Sellers who have placed items for sale on internet trading sites such as Gumtree and have been given fake banknotes in exchange.
A police spokesman said: “The serial numbers on notes should be compared against each other, along with a general examination of the money prior to any goods exchanged.
“If you suspect the money to be counterfeit then do not accept it and contact Police on 101.”
Sellers asked to be vigilant of counterfeit banknotes circulating north and north-east