Chicken sandwich chain continues to investigate a possible data breach, trying to find out whether its payment system was hacked.

Chick-fil-A mentioned “payment industry contacts” in its official announcement, which likely means credit card companies and banks. The company has contacted authorities and cybersecurity companies seeking for help in investigation of the suspicious activity, “involving payment cards at some of the restaurants”.

The matter is that a number of financial institutions had traced the common point-of-purchase on cards with suspicious activity to Chick-fil-A locations. The industry experts believe that a breach of the company’s locations would likely have affected only a fraction of its nearly 2,000 restaurants. In the meantime, along with a wealth of credit card data and personal information, the hackers can create counterfeit cards or sell the data to third parties. Chick-fil-A promised that if investigation confirms a data breach, the customers of the fast food chain wouldn’t be held liable for relevant charges. In addition, Chick-fil-A would arrange identity protection services for affected customers.