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A sign for Fazio Mechanical Services Inc. is at their location in Sharpsburg, Pa. on Friday, Feb. 7, 2014. The western Pennsylvania heating and refrigeration contractor issued the statement late Thursday, Feb. 6, 2014 saying it was the victim of a "sophisticated cyberattack operation." The statement came days after Internet security bloggers identified it as the third-party vendor through which hackers accessed Target's computer systems. (AP Photo/Keith Srakocic)

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Hackers may have used Pa. company to hit Target

The hackers who stole millions of customers' credit and debit card numbers from Target may have used a Pittsburgh-area heating and refrigeration business as the back door to get in

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