Police in Derry and Strabane are urging people to be vigilant following reports of counterfeit currency notes in circulation.
A PSNI spokesperson said: "Members of the public and retailers are advised to be on the look out for counterfeit £20 notes currently in circulation.
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"Police have received several reports in the Derry City and Strabane area of people attempting to use them as legal currency.
"Please be aware, these do appear to pass the UV light test, however a tell tale sign is the lack of 3D braile marking, and no watermark when held up to the natural light.
"Should you discover you have come into possession of such counterfeit currency, or suspect someone has attempted to pass it to you, then please contact Police on 101 to report this."
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