(Bloomberg) -- The Russian hackers who hit the Democratic National Committee and Hillary Clinton’s campaign burrowed much further into the U.S. political system, sweeping in law firms, lobbyists, consultants, foundations and the policy groups known as think tanks, according to a person familiar with investigations of the attacks.

Almost 4,000 Google accounts were targeted in an elaborate “spear phishing” campaign -- intended to trick users into providing access so that information could be gleaned from personal and organizational accounts -- from October through mid-May, according to the person, who asked not to be identified discussing confidential information.

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