Target says that its stores have been hit by a major credit-card attack involving up to 40 million accounts.  The retailer said that the unlawful access to customer information took place between Nov. 27 and Dec.15.

Earlier, the Secret Service confirmed to USA TODAY that it is investigating the massive data violation involving shoppers’ personal credit-card information. The breach began around Black Friday, the day after Thanksgiving and the busiest shopping day of the year.

The breach involves the theft of information stored on the magnetic stripe on the backs of cards used at nearly all of Target’s stores around the country, according to the Krebs on Security website, who first reported the news.


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