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(Bloomberg) — International Dairy Queen, the ice cream chain owned by Warren Buffett’s Berkshire Hathaway Inc., said customer data were compromised by hackers.

The breach with the so-called Backoff malware affected 395 of more than 4,500 U.S. locations, the unit of Omaha, Nebraska- based Berkshire said today in a statement. The systems contained customer names, and the numbers and expiration dates of their payment cards. Less than 600,000 cards were affected, said Dean Peters, a spokesman for Dairy Queen.

The Backoff software has been used to target more than 1,000 businesses, according to the U.S. Secret Service. Dairy Queen said it will provide identity-repair services for a year to customers of the locations that were struck.

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