Target Investigates Breach Involving Credit Card Data

SAN FRANCISCO — Target is investigating a security breach involving stolen credit card and debit card information for millions of its customers, according to one person involved in the investigation.

The breach, which was first reported Wednesday by Brian Krebs, a security blogger, began the day after Thanksgiving, and may be continuing, according to the person involved in the investigation, who spoke only on condition of anonymity.

It is unclear whether Target’s online customers were affected. Cybercriminals appear to have focused on the point-of-sale systems in Target’s retail stores, which collect information from customers’ credit and debit cards, and potentially personal identification numbers, or PINs.
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