Chili's Grill & Bar has reported a "data incident" of credit card information at some locations between March and April.
Chili's parent company, Brinker International, said Friday that "some Chili's restaurants have been impacted by a data incident, which may have resulted in unauthorized access or acquisition of your payment card data".
Chili's is working with third-party forensic experts to find out exactly what happened and who was affected.
In a statement, officials said it is believed customers who visited between March and April may be impacted.
Chili's says they "have no reason to believe" there are any further threats that make using a credit card at the chain risky now that the malware attack has been neutralized. Law enforcement was also notified of the incident.
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Chili's officials said "we deeply value our relationships with our guests and our priority remains doing what is right for them".
Personal information such as social security number, full date of birth, or federal or state identification number was not collected.
"However, out of an abundance of caution, we recommend that you remain vigilant and consider taking one or more [.] steps to avoid identity theft, obtain additional information, and protect your personal information".
Customers are advised to contact nationwide credit-reporting agencies Equifax, Experian and Transunion to add a fraud alert statement to their credit file.
Chili's says it will provide the most up-to-date information on this website.