The City Centre Initiative (CCI) has issued a warning after fake £20 notes were found to be in circulation in Derry.
Some of the counterfeit cash has been handed over to local businesses.
The Serial Number of one of the counterfeit notes is: C32 146682
"We have been made aware that counterfeit Royal Bank of Scotland £20 notes are in circulation and some businesses have been unfortunate to accept them at the point of sale," a CCI spokesperson said.
"We would encourage all businesses to check all notes over the festive period and report any attempts to use counterfeit currency to the PSNI using the non emergency line '101'."
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