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Yahoo Says It’s Investigating Security Breach

By: Kathleen Chaykowski and Jordan Robertson, Bloomberg

Yahoo! Inc. (YHOO), operator of the biggest U.S. Web portal, said that as many as 450,000 user names and passwords were stolen from one of its sites.

Hackers took a file on July 11 containing login credentials for Yahoo and other accounts, such as Google Inc. (GOOG)’s Gmail, Microsoft Corp. (MSFT)’s Hotmail and AOL Inc. (AOL), from a Yahoo site featuring user articles, videos and slideshows, the company said in an e-mailed statement today.

Yahoo joins a growing list of Internet companies such as LinkedIn Corp. (LNKD), CBS Corp. (CBS)’s Last.fm music site and EHarmony Inc. that have recently had user information compromised.

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