Brinker also said Chili's payment system was not created to store personal information such as social security number, full date of birth, or federal or state identification number.
"Currently, we believe the data incident was limited to between March - April 2018; however, we continue to assess the scope of the incident", the notice said.
Chili's Bar and Grill has revealed a data breach that happened at some of its restaurants and may have impacted customers earlier this year.
In a statement released Saturday, the company says the "data incident" affects in-restaurant purchases made between March 2018 and April 2018 at certain Chili's restaurants.
The announcement of the breach came just a day after Brinker says it discovered it, and just a few weeks after it reportedly occurred. The company said it is still investigating the incident together with law enforcement and third-party forensic experts.
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Nine of the attackers were killed by police while lone survivor Ajmal Kasab was caught and hanged after handed down death sentence.
A more detailed post online by the chain's owner, Brinker International, said payment card numbers and customer names were taken.
Chili's officials said "we deeply value our relationships with our guests and our priority remains doing what is right for them".
The statement does make it clear that not all guests were impacted and no personal information such as social security numbers, dates of birth and ID numbers were compromised. An investigation is ongoing.
Credit fraud resolution and credit monitoring services will be provided to customers, according to the statement, but details have not been finalized.