Ten years after nearly two dozen federal agencies were gathered together to create the Department of Homeland Security, the agency has yet to adequately define and implement a plan for dealing with cyberthreats against U.S. infrastructure, officials say. Defense experts and former DHS officials testifying before a Senate panel said that while the agency responded to nearly 200,000 cyberincidents in the past year, it is no closer to a unified strategy for neutralizing the threat.

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