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BENTONVILLE, Ark. -- Visa and MasterCard were joined by Wal-Mart to investigate credit-card fraud affecting customers who bought gasoline at Sam's Club stations, reported Bloomberg.
About 600 cardholders who used their MasterCard or Visa credit cards at the fuel stations between Sept. 21 and Oct. 2 are known to be affected, Wal-Mart's Sam's Club division said in a statement.
The investigation began after credit-card issuers reported some cardholders were noticing fraudulent charges on their statements. Currently, there is no explanation on how the information was obtained. The electronic systems and databases used inside Sam's Club stores weren't involved, the statement said.
"The primary concern at Sam's Club is the protection of our members," said executive vice president Mark Goodman. "We will do everything possible to make sure their private information is protected from unauthorized use or disclosure."
Sam’s Club is working with Visa and MasterCard to identify and hold accountable those responsible for the fraud. The company also has notified the U.S. Attorney's Office for the Western District of Arkansas and the United States Secret Service and asked for their assistance in the investigation.