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"Twitter issued a blog post late Friday announcing a possible security breach and live attack that may have given hackers access to 250,000 users' information. \nFrom the post:\nThis week, we detected unusual access patterns that led to us identifying unauthorized access attempts to Twitter user data. We discovered one live attack and were able to shut it down in process moments later. However, our investigation has thus far indicated that the attackers may have had access to limited user information \u2013 usernames, email addresses, session tokens and encrypted/salted versions of passwords \u2013 for approximately 250,000 users.\nTwitter's director of information security, Bob Lord, said in the post that the site has reset passwords and revoked session tokens for the accounts that may have been compromised. \nHe didn't say who may be behind the attack, but Lord wrote that the company is working with federal law enforcement to find and prosecute the attackers. \"This attack was not the work of amateurs, and we do not believe it was an isolated incident,\" he wrote. \"The attackers were extremely sophisticated, and we believe other companies and organizations have also been recently similarly attacked.\" \nThe attack on Twitter follows a recent string of high-profile sites, including the New York Times and Wall Street Journal, targeted by hackers. The news organizations said evidence showed the attacks originating in China. \nThose users who may have been affected will receive, if they haven't yet, an email notifying them of the password reset. \n\"Twitter believes that your account may have been compromised by a website or service not associated with Twitter,\" the notification email says. \"We've reset your password to prevent others from accessing your account.\"\n\nTop image courtesy of iStockphoto,  sykono "^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2013/02/01/twitter-security-breach/>