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      Yahoo email addresses hacked

      LONDON (AP) - A security breach -- and a big one -- at Yahoo. The company says some 450,000 users email addresses and passwords have been leaked.

      In a statement, Yahoo says just a small fraction of the stolen passwords were valid because they came from an "old file" from the Yahoo Contributor Network, a content sharing platform.

      Yahoo says it's plugging the security hole that led to the leak. It is also changing the passwords of affected users and alerting other companies whose users' accounts may have been compromised.

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