Target says about 40 million credit and debit card accounts may be affected by a data breach that occurred just as the holiday shopping season shifted into high gear.
The chain said customers who made purchases by swiping their cards at terminals in its U.S. stores between Nov. 27 and Dec. 15 may have had their accounts exposed. The stolen data includes customer names, credit and debit card numbers, card expiration dates and the three-digit security codes located on the backs of cards.
The data breach did not affect online purchases, the company said.
The stolen information included Target store brand cards and major card brands such as Visa and MasterCard.
"Target's first priority is preserving the trust of our guests and we have moved swiftly to address this issue, so guests can shop with confidence. We regret any inconvenience this may cause," Chairman, President and CEO Gregg Steinhafel said in a statement Thursday.
The Minneapolis company said it immediately told authorities and financial institutions once it became aware of the breach and that it is teaming with a third-party forensics firm to investigate and prevent future breaches. The company said it is putting all "appropriate resources" toward the issue.
Target Corp. advised customers to check their statements carefully. Those who see suspicious charges on the cards should report it to their credit card companies and call Target at 866-852-8680. Cases of identity theft can also be reported to law enforcement or the Federal Trade Commission.
Even if Target shoppers haven't noticed suspicious activity on their credit card accounts, a Target spokeswoman said, "we encourage everyone to be vigilant."
Target hasn't disclosed exactly how the data breach occurred, but said it has fixed the problem and credit card holders can continue shopping at its stores.