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Bloomberg reports that Target Corp. believes that the breach that affected tens of millions of its customers' debit and/or credit card data, may have occurred when an "intruder" stole a vendor's credentials and was able to hack into its systems.

No further information yet has been made available. Federal authorities are investigating the Target breach, as well as a breach at Neiman Marcus and a suspected similar problem at Michaels, the crafts chain.
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