BALTIMORE (WJZ)—An investigation into a malware attack that hit hundreds of Hyatt Hotels is now complete, according to a report posted on the company’s website.

In the report, nearly 100 hotels in the United States, including three locations in Maryland, were among those affected by the breach.

The investigation identified signs of unauthorized access to payment card data from cards used onsite at certain Hyatt-managed locations, primarily at restaurants, between August 13, 2015 and December 8, 2015.

The company also says that a small percentage of the at-risk cards were used at spas, golf shops, parking, and a limited number of front desks, or provided to a sales office during this time period.

The malware was designed to collect payment card data: cardholder name, card number, expiration date and internal verification codes from cards used onsite as the data was being routed through affected payment processing systems.

Hyatt says there is no indication that other customer information was affected.

“Protecting customer information is critically important to Hyatt, and we take the security of customer data very seriously,” said Chuck Floyd, global president of operations for Hyatt. “We have been working tirelessly to complete our investigation, and we now have more complete information that we want to share so that customers can take steps to protect themselves. Additionally, we want to assure customers that we took steps to strengthen the security of our systems in order to help prevent this from happening in the future.”

Three hotels in Maryland were among those affected including, Hyatt Regency Baltimore (Aug. 13, 2015 – December 8, 2015), Hyatt Regency Bethesda ( Aug. 13, 2015 – October 14, 2015) and Hyatt Regency Chesapeake Bay Golf Resort, Spa and Marina in Cambridge, Maryland (Aug. 13, 2015 – December 8, 2015.)

CLICK HERE for a full list of hotel affected.

Hyatt encourages customers to review their payment card account statements and report any unauthorized charges.

Customers with questions may call 1-877-218-3036.

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