The police are warning the public remain vigilant after it emerged that fake £20 notes in Northern Ireland are in operation.
Sharing pictures on social media of the back and front of the note, the PSNI said fake money had been already been used in one local business in Derry city centre.
According to the police, the counterfeit used had the '"same serial number" and the public is being asked to look out for notes that "are thicker and heavier than normal".
