Arts and crafts retailer Michaels is reporting a security breach involving two and a half million credit and debit cards. The chain also said about 400-thousand payment cards for its subsidiary Aaron Brothers may have been breached by sophisticated malware.

Michaels says the malware is no longer a threat for its customers and that the hacked systems contained only card numbers and expiration dates.

The Michaels security attack occurred between May of 2013 and the end of January this year.

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