“Staples is in the process of investigating a potential issue involving credit card data and has contacted law enforcement,” company spokesman Mark Cautela said in a statement. “If Staples discovers an issue, it is important to note that customers are not responsible for any fraudulent activity on their credit cards that is reported on a timely basis.” The office supply retailer disclosed the investigation after security reporter Brian Krebs reported on his blog Krebsonsecurity.com that several banks have identified a pattern of payment card fraud suggesting that several Staples stores in nor