Yahoo! Inc. said today that a security breach on its site exposed 450,000 user names and passwords for accounts at Yahoo and other Internet services such as Microsoft Corp.'s Hotmail and AOL Inc.

A file containing login credentials for Yahoo and other accounts was stolen from a Yahoo site featuring user articles, videos and slideshows on July 11, the company said in an e- mailed statement today.

“At Yahoo we take security very seriously and invest heavily in protective measures to ensure the security of our users and their data across all our products,” the Sunnyvale, California-based company said in the statement. ''We are taking immediate action by fixing the vulnerability that led to the disclosure of this data, changing the passwords of the affected Yahoo! users and notifying the companies whose users accounts may have been compromised. We apologize to all affected users.''

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