The Barnes & Noble store in Calabasas is among 63 locations where credit and debit card pads have been tampered with, the company said, according to a report in the Ventura County Star.
The company warned customers to check for unauthorized transactions and to change their PIN numbers, said the newspaper. It company has not divulged how many accounts may have been compromised.
The New York Times, citing a high-ranking company official it did not name, reported that hackers had made unauthorized purchases on some customer credit cards, said the VC Star.
The Calabasas store at 4735 Commons Way was listed as among the locations affected across the country, the newspaper reports.
According to the report, the New York-based bookseller said in a statement Tuesday only one of the devices, known as PIN pads, was tampered with in each of the 63 stores.
Other states that were affected include Connecticut, Florida, Illinois, Massachusetts, New Jersey, New York, Pennsylvania and Rhode Island.
All of the PIN pads in its nearly 700 stores nationwide were disconnected Sept. 14 after the company learned of the tampering, said the report, and federal authorities are involved in the investigation.
Barnes & Noble said it is currently working with banks and card issuers to identify compromised accounts, said the report.