Video: Credit card security breach

Visa and MasterCard are urging their customers to double-check their bills for unauthorized charges after Global Payments Inc. warned customer accounts may be at risk. NBC?s Pete Williams reports.

>>> another story that's getting a lot of attention tonight, news of a major security breach exposing potentially millions of credit card holders to identity theft. tonight, a federal investigation is under way and our justs correspondent, pete williams , joins us now from washington with the details. pete, good evening.

>> lester, it's unclear how many credit card accounts were effected, but the early estimates is this was relatively small as these attacks go. the target of the security breach was not the credit card companies themselves, visa, mastercard, and american express . instead, it was a hacker company that accessing the pipeline. the early estimates are it could involve 2 million accounts, but it's unlikely all of the card holders had their critical information stolen. so tonight, the credit card companies urge their customers to double check their bills for unauthorized charges and they won't be responsible for fraudulent charges.

>>> also developing, president obama is moving ahead with tough new moves to squeeze iran. our chief foreign affairs correspondent andrea mitchell joins us from washington

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