2011 — Citigroup: A breach of an unnamed merchant or merchants may…

A breach of an unnamed merchant or merchants may have resulted in the exposure of customer credit and debit card information.  Citigroup deactivated the credit cards of affected customers and notified them that Citigroup had been informed of a security breach at a retailer.  Within a week, Bank of America also sent new debit cards to some customers after learning that some accounts may have been compromised at a merchant.