DUQUESNE, Pa. (KDKA) — Authorities are warning local businesses to look out for counterfeit money in the City of Duquesne.

A woman allegedly tried to use a counterfeit $100 bill in a store located in Duquesne, according to a post on the City of Duquesne Police Department’s Facebook page Sunday.

Although the bill in question was $100, the department’s post says counterfeit $20 bills and $10 bills are more common. Police encouraged local businesses to warn their employees and to be “especially mindful of checking the authenticity of bills tendered.”

The department’s post included a photo from the U.S. Treasury Department that details how to recognize counterfeit money. Police also urged businesses to call 911 if they encounter someone trying to use a fake bill.