TJ Maxx is one of the stores targeted in this credit card theft case. Photo: David McNew, Getty Images

More charges are mounting in what prosecutors believe is the biggest identity theft case ever prosecuted.

Albert "Segvec" Gonzalez and two unnamed conspirators have been indicted by a federal grand jury in New Jersey. The charges state they hacked into five companies' databases, including credit card processors Heartland Payment Systems, Hannaford Bros. grocers and 7-Eleven, stealing numbers from more than 130 million credit and debit cards.

Gonzalez, 28, of Miami, is awaiting trial on 2008 charges that he hacked into and stole numbers from TJX, DSW, Forever 21, Sports Authority, OfficeMax, Dave & Busters and other companies. That case cost TJX, the parent company of TJ Maxx, about $200 million, according to the Wall Street Journal.

"We're not seeing a huge array of hackers capable of doing this, but rather a more select group, (and that) demonstrates that there is a level of sophistication involved in these hacks," Assistant U.S. Attorney Erez Liebermann of the Justice Department's New Jersey district office told Wired.com.

The maximum penalty is five years in prison and a possible fine of $250,000 on the computer-fraud count and an additional 30 years and $1 million fine on the wire-fraud count, or twice the amount they gained from the offense, whichever is greater, Wired.com reports.

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