Target Corp said up to 70 million customers were hit by the theft of data over the holiday shopping season, a far more serious breach than previously disclosed. Shares of the company, which also slashed its fourth-quarter earnings forecast, fell slightly in early trading on Friday. The third-largest U.S. retailer said in December that hackers had stolen data from up to 40 million credit and debit cards between November 27 and December 15, the second-largest such breach reported by a U.S. retailer. The news raised concerns that Target had not yet fully grappled with the extent of the data breach.
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