Freetown police are warning people to watch out for counterfeit bills after a phony $100 bill turned up at a local bank.

Police said the counterfeit money was actually a $1 bill made to look like a $100 bill.

Since the bill is still made of banknote paper, police warned businesses that counterfeit detector pens would show the phony $100 to be real money.

Police said detectives are investigating the bill's origin and they will be turning over the counterfeit $100 bill to the U.S. Secret Service.