Skimming devices were discovered planted inside pumps at three gas stations in Omaha, Nebraska.
One customer said her bank notified her of a suspicious gas purchase in California for about $100.
Secret Service Agent in charge of the Omaha office John Gutsmiedl said it is likely hackers passing through the area using universal keys to open pumps and install the small devices in minutes.
Investigators believe the devices had been on pumps from September through the first week in January.
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