Anonymous hackers attacked Twitter this week and may have gained access to passwords and other information for as many as 250,000 user accounts, the microblog revealed late on Friday.
Twitter said in a blog post that the passwords were encrypted and that it had already reset them as a "precautionary measure," and that it was in the process of notifying affected users.
The blog post noted recent revelations of large-scale cyber attacks against the New York Times and the Wall Street Journal, but unlike the two news organizations, Twitter did not provide any detail on the origin or methodology of the attacks.
"This attack was not the work of amateurs, and we do not believe it was an isolated incident," Twitter said. "The attackers were extremely sophisticated, and we believe other companies and organizations have also been recently similarly attacked."
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