U.S. investigators plan to announce criminal charges concerning the alleged theft of email addresses and other personal information belonging to about 120,000 users of Apple Inc's iPad tablet computer.

Prosecutors said the charges arise from an alleged hacking of AT&T Inc's servers, which affected iPad users who accessed the Internet through AT&T's 3G network.

Paul Fishman, the U.S. attorney for the District of New Jersey, and the FBI plan to hold a press conference Tuesday afternoon to discuss the charges.

(Reporting by Jonathan Stempel in New York, editing by Dave Zimmerman)

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