The Irving, Texas-based arts and crafts supplier says the PIN pad tampering appears to have happened in its Chicago-area stores. Banking and law enforcement officials contacted the company this week after fraudulent transactions were reported last weekend.
Officials believe those fraudulent transactions are linked to legitimate transactions in the Chicago area. The company says it is assisting investigators.
Michaels advises its customers to monitor their statements, report any suspicious account activity and change their personal identification numbers.
If someone thinks their account information was comprised they should contact their credit issuers.