Douglas County sheriff’s investigators say thieves have targeted northwest Omaha gasoline pumps to steal credit card information.

Chief Deputy Sheriff Marty Bilek tells Omaha television station KETV that thieves installed a second card reader inside four gas pumps in northwest Omaha.

The contraption takes information off the credit card’s magnetic strip as a driver swipes the card to pay for gas. The thieves then use that information to create a duplicate card.

Bilek says at least four gas stations had the skimmers secretly installed at their pumps. Investigators know of at least four victims, but say there will be more. They encourage anyone who has paid for gas at the pump to check their credit card statements.