Another major US retailer may have had customer credit card details fall victim to cyberattack. Michaels, which sells art and craft supplies at over 1,100 stores in the US and Canada, has just announced that its working with federal law enforcement agencies and independent security analysts to investigate a potential data breach. While the company says that it hasnt yet confirmed an actual breach, cyber security expert Brian Krebs — who has been closely monitoring the Target and Neiman Marcus attacks — says that Michaels does have reason to believe that data theft might have occurred. According to his sources, four different financial institutions traced hundreds of fradulent purchases back to cards that had been used at Michaels stores. Krebs also writes that one fraud analyst in particular said fraudulent activity had also been seen around Aaron Brothers, a wholly-owned subsidiary of Michaels with 130 stores across the country.