HIAWATHA – Law enforcement authorities in Brown County are investigating several reports of counterfeit $10 and $20 bills.

At least three serial numbers have been duplicated, according to authorities.

Police in Hiawatha reported the arrest of Jeffrey Kosman, 31, Kansas City, after a bar in Hiawatha reported receiving a counterfeit $20 bill.

Kosman was booked into the Brown Co Jail on possession of narcotics, drug paraphernalia, and making false information.

No formal charges have been filed. Additional arrests are possible as authorities continue to investigate.