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Six US senators demanded that Yahoo Inc explain why hackers' theft of user information for 500 million accounts two years ago came to light only last week.
Democratic Senator Mark Warner asked the US Securities and Exchange Commission to investigate whether Yahoo and its senior executives fulfilled obligations to inform investors and the public about a hacking attack affecting 500 million user accounts.
Yahoo faced pointed questions about exactly when it knew about a cyberattack that exposed the e-mail credentials of 500 million users.
Google Inc is rating Internet service providers' video streaming quality on a new website, the latest development in the fight between broadband providers and content companies over who is to blame for slow streaming speeds.
BlackBerry shares rose 14% amid takeover speculation and news that AT&T will sell the Z10 in the US.