CHICAGO (CBS/AP) — A Chicago-based parking facility provider says payment systems at 10 parking garages in Chicago and three in Evanston were hacked to capture credit card information.

SP Plus issued a statement Friday. The company says it has fixed the problem and has taken steps so banks issuing the credit cards can monitor for unauthorized charges.

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Customers who see suspicious charges should contact the banks issuing their credit cards.

Parking garages in Chicago include those at the John Hancock, the Aon Center, Aqua and Presidential Towers.

Facilities in Evanston are Church, Maple and Sherman garages.

“I’m guessing that there’s a weakness in these systems and a hacker obviously knew this and exploited it. And there’s a lot of credit card activity that goes on at these parking garages,” Mike Brockaway, who runs the blog, tells CBS 2.

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For a comprehensive list provided by the company — including dates users may have been at risk — click here.

SP Plus says a garage in Cleveland, two in Philadelphia and one in Seattle also were affected.

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