Jimmy John's is the latest company to experience a data breach compromising customer data.
216 stores nationwide, including several in Illinois, are believed to be affected.
In an announcement released today, the sandwich company said an "intruder" stole log-in credentials from its point-of-sale vendor, allowing the "intruder" to access customer's credit and debit card information between June 16 and September 5. The company said it first learned of the breach on July 30.
The announcement states that the breach affects in-store purchases with swiped credit or debit cards, and not purchases made online.
The company recommends customers monitor their card statements for unusual activity.