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NEW YORK (AP) – Hyatt, Sheraton, Marriott and Westin hotels in 10 states and the District of Columbia may have been targeted by hackers for months.

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According to the hotel operator, HEI Hotels & Resorts, malware put into place in at least 20 locations may have collected names, card account numbers, card expiration dates and verification codes.

Data from customers may have been collected from early December, through late June. At some properties, HEI said, data collection may have begun as early as March 2015.

A release from HEI says the DFW Marriott Hotel & Golf Club in Fort Worth, at 3300 Championship Parkway, was affected from December 26, 2015 through April 28, 2016.

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Online: List of Affected HEI Properties

HEI said in a company release that “We take very seriously our responsibility to keep our customers’ information secure, and have mounted a thorough response to investigate and resolve this incident, bolster our data security, and support our customers. ”

The company says the incident has been contained and customers can safely use cards at all of its properties.

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