Chili's Grill & Bar is warning customers about a credit data breach that has put an unknown amount of customer data at risk.

Customers who used a credit card at Chili’s in March or April are at risk.

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In a statement, Chili's said the malware was used to gather credit and debit card numbers and cardholder names for in-restaurant purchases.

It is unclear how many Chili’s restaurants have been affected.

The chain operates dozens of restaurants across the country, with a total of more than 1,600 locations around the world.

Chili’s said it is working with law enforcement and a third-party investigator to determine the scope of the breach.

The chain is warning customers to monitor their bank statements closely and report any unusual activity.

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