AMARILLO (June 18, 2009)—Police in Amarillo are looking for suspects in the passing of $5 bills that have been altered to look like $100 bills.

Police say various merchants recently have been duped with about $4,000 worth of the fake $100 bills, including an incident Tuesday night.

Police say some of the altered currency still had faint Abraham Lincoln markings, like real $5 bills.

Investigators believe the $5 bills are being washed until the ink fades, then the bills are reprinted with $100 designations.