whole foods market
Indianapolis - Circa July 2017: Whole Foods Market. Amazon announced an agreement to buy Whole Foods for $13.7 billion (Jonathan Weiss / Shutterstock.com)

Whole Foods Market, which was acquired by Amazon who bought for $13.7 billion in June, warned customers on Thursday that hackers stole credit card information from several of its stores. The hack affected Whole Foods’ taprooms and restaurants, not stores’  primary checkout lines, the company announced in a statement.

The in-store taprooms and restaurants use a different payment gateway than Whole Foods checkout. Also, the hack did not affect Amazon’s payment servers because they are also not connected to Whole Foods’ stores, Whole Foods announced on Thursday.

Whole Foods
New York, March 11, 2017: People are coming in a Whole Foods grocery store on Union Square in Manhattan. (Roman Tiraspolsky / Shutterstock.com)

These cyber attacks often affect popular chains. For example, Chipotle and Wendy’s were hit with cyber attacks, with hackers stealing customer credit card information.

Currently, Whole Foods has over 400 stores and more than 40 stores sell beer on tap.

“While most Whole Foods Market stores do not have these taprooms and restaurants, Whole Foods Market encourages its customers to closely monitor their payment card statements and report any unauthorized charges to the issuing bank,” the company said in a statement.

Whole Foods said it’s working with a cybersecurity firm and plans to investigate who is behind the cyber attack.