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The National Security Agency's head said China has the ability to shut down our nation's power grid. Jim Sciutto reports.
CIA Director John Brennan has ordered a review of the agency's organizational structure amid new terror threats.
A suicide car bomb detonated near an Iraqi government building, killing at least four people. CNN's Jim Sciutto reports.
CNN's Jim Sciutto reports there may not be enough drones to keep up with the U.S. battle against growing terror threats.
The hunt to track down ISIS executioner 'Jihadi John' is underway after another beheading video surfaces.
CNN's Brian Todd outlines the difference of the latest ISIS execution video and the clues it might give authorities.
The White House fence-jumping incident prompts a review. It faults Secret Service's training and communications.