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Customers at 18 Jimmy John's shops in Michigan are among others nationwide whose credit and debit card data could have been stolen in a possible security breach this summer, the chain announced Wednesday.

Officials learned of the situation July 30 and said that "it appears customers' credit and debit card data was compromised after an intruder stole log-in credentials from a Jimmy John's point-of-sale vendor and used these stolen credentials to remotely access the point-of-sale systems at some corporate and franchised locations" between June 16 and Sept. 5, according to a statement on the website.

The cards in question appear to have been swiped at the stores, not entered manually or online, Jimmy John's said.

About 216 stores were affected. The locations and dates in Michigan:

■Madison Heights, 1535 E. 12 Mile: June 16-Aug. 7

■Sterling Heights, 40846 Van Dyke: June 16-Aug. 7

■East Lansing, 4790 S. Hagadorn: June 16-Aug. 2

■East Lansing, 143 N. Harrison, Ste. 100: June 16-July 30

■Ypsilanti, 537 W. Cross: June 16-July 30

■Warren, 7568 E. 9 Mile: June 16-Aug. 13

■Novi, 31204 Beck: June 26-Aug. 1

■Canton, 6535 N. Canton Center: June 27-Aug. 13

■Niles, 1260 S. 11th: July 1-Aug. 2

■Livonia, 33177 W. 8 Mile: July1-July 30

■Sterling Heights, 36324 Van Dyke: July 1-Aug. 1

■Bloomfield Hills, 4087 W. Maple: July 1-Aug. 3

■Marquette, 3220 U.S. Hwy 41 W: July 1-Aug. 8

■Novi, 39755 Grand River: July 23-Aug. 1

■Royal Oak, 413 S. Main: July 23-Aug. 1

■Livonia, 37671 Six Mile, B218: July 23- Aug. 2

■Bay City, 719 Washington: July 23-Aug. 1

■Clarkston, 5601 Sashabaw: July 23-Aug. 1

"Jimmy John's has taken steps to prevent this type of event from occurring in the future, including installing encrypted swipe machines, implementing system enhancements and reviewing its policies and procedures for its third party vendors," officials said Wednesday.

Jimmy John's said the chain is offering identity protection services to impacted customers. For more information: (855) 398-6442 or www.jimmyjohns.com.

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