Humberside Police is urging businesses to be aware of the threat of counterfeit money, following reports of forged notes being used to pay for goods from a snack bar on Esplanade, Bridlington, at 1.42pm on Tuesday August 13.
A man and a woman are believed to have been responsible, say police.
The man is described as white with a very broad build. He was wearing long denim shorts and a black t-shirt, had a shaven head, and tattoos on both biceps.
The woman had a slight build with long dark hair. She was wearing green trousers and black top.
Police are aware of four counterfeit £20 notes being used and are urging shops and amusements in the Bridlington area to check if they have been passed forged money.
Anyone with information about who is using counterfeit money in the area should contact Humberside Police on the non emergency number 101 quoting log number 303 of August 13.