Secret Service investigating massive credit card breach at Target (Updated)

UPDATE Thursday 5:34am CT: In a statement posted to its website early Thursday morning, Target acknowledged that "approximately 40 million credit and debit card accounts may have been impacted between Nov. 27 and Dec. 15, 2013," adding that the company is "partnering with a leading third-party forensics firm to conduct a thorough investigation of the incident."

Original story follows:

According to the Wall Street Journal and independent journalist Brian Krebs, retail giant Target was hit with a major theft of customers’ credit-card and debit-card data captured in stores during the Black Friday weekend.

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