According to reports, office supply superstore Staples is investigating a possible hack attack.
A report by security expert Brian Krebs has suggested that several of its stores in north-east America have been affected by a breach.
The US has called for a swift move to chip and pin technology, and stores are gradually making the move from using magnetic strip payment cards to the more secure - chip and pin.
Many stores are now running through the changes following a number of high-profile breaches where hackers put card-stealing malware on cash registers.
Krebs has written widely on retail data breaches and in particular on the recent attack on Staples stores in New York, Pennsylvania and New Jersey.
He said: "Multiple banks say they have identified a pattern of credit and debit card fraud suggesting that several Staples Inc. office supply locations in north-eastern United States are currently dealing with a data breach."
Company spokesman Mark Cautela said: "Staples is in the process of investigating a potential issue involving credit card data and
has contacted law enforcement."
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