A third Chick-fil-A restaurant is in the planning stages for Mount Pleasant. File photo

Popular fast food chain Chick-fil-A announced Friday that it is investigating a potential data breach at several of its restaurants.

The Atlanta-based company with more than 1,850 locations nationwide, including 15 in the Lowcountry, said it "recently received reports of potential unusual activity involving payment cards used at a few of our restaurants."

The announcement came several weeks after Krebs on Security, a website about cyber security run by journalist Brian Krebs, posted information from unnamed sources in the banking industry about the potential hack.

According to that report, financial institutions were notified by a major credit card company late last month of a breach at an unidentified retailer from Dec. 2, 2013 to Sept. 30, 2014. Sources reportedly told Krebs that the only common purchases by credit cards included in the alert were made at Chick-fil-A.

The chicken chain has not specified where the reports of "unusual activity" originated, or which locations could have been involved in a breach.

The company said it is working with "leading IT security firms, law enforcement and our payment industry contacts to determine all of the facts" and will report more information as it becomes available.

"If the investigation reveals that a breach has occurred, customers will not be liable for any fraudulent charges to their accounts," Chick-fil-A said in the statement. "Any fraudulent charges will be the responsibility of either Chick-fil-A or the bank that issued the card. If our customers are impacted, we will arrange for free identity protection services, including credit monitoring."

Concerned Chick-fil-A customers are urged to call 855-398-6439 for more information.