Hack Attack: Massive Security Breach at Target Gets Worse

Up to 110 million people affected, the largest identity theft ever.
3:00 | 01/10/14

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Transcript for Hack Attack: Massive Security Breach at Target Gets Worse
giant, target sending out a big alert today that breach of shoppers' private information, bigger than they knew, nearly three-times bigger, including home addresses and phone numbers. Abc's rebecca jarvis with what this means for every shopper. Reporter: Target, admitting the holiday hacking incident it thought impacted 40 million credit and debit cards, actually hitting as many as 70 million more. Who not only shopped in stores, but also online. Tonight, in the hands of criminals. Plus, this new twist -- not just those who shopped at targtd over the holidays but any paint in the past. How significant is is that? That is -- with all of that information they can pretend to be you. It's big and getting bigger. Reporter: Identity theft expert said they can use their info in a matter of seconds. Case in point, katie from wisconsin, she had her credit card hacked. They went to stores that i never been to and successfully opened up 11 to 14 different credit cards. Reporter: Crooks hitting every store on this block on $15,000 shopping spree, $1,000 mac book at best buy. In a matter of hours. Target ceo apologizing, aufrlg customers a year of free credit monitoring. But for some, the damage may already be done. Rebecca is here now, these numbers are huge, how do our viewers know if they're one of the people hit? You want to monitor your bank and credit card daily. Diane, lastly, watch for strange e-mails, phone calls, even mail to your home, identity thieves can pose as trusted organizations. Never respond. As many as 1 in 3. Thank you, tonight, rebecca jarvis right here, the scandal

This transcript has been automatically generated and may not be 100% accurate.

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