If you shopped at Target between November 27 and December 15 of this year, your credit or debit card information might have been compromised. Target officials say the credit and debit card information of 40 million people may have been stolen in a huge data breach that happened as the Christmas shopping season kicked off.

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Whoever stole the information has customer names, credit and debit card numbers, card expiration dates, and the three-digit security codes located on the backs of those cards. Target officials say they immediately notified authorities and banks as soon as they found out about the security breach.

Target officials say you should check your bank statement, and if you see any unauthorized charges, report it to your bank and credit card company, and call Target at 866-852-8680.

Target didn't say how all those numbers were stolen, but they say they’ve fixed the problem and it is safe to shop at their stores.  They also said the security breach only affected in-store shoppers, not online transactions.