Michaels Stores, the biggest U.S. arts and crafts retailer, on Thursday confirmed that there was a security breach at certain systems that process payment cards at its U.S. stores and that of its unit, Aaron Brothers. The company said in January that it was working with federal law enforcement officials to investigate a possible data breach. Michaels Stores said the breach, which took place between May 8, 2013 and January 27, 2014, may have affected about 2.6 million cards, or about 7 percent of payment cards used at its stores during the period. There was no evidence that data such as customers’ name or personal identification number were at risk, Michaels Stores said in a statement.
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