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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.
Russia has denied allegations that it has sent weapons inside Ukraine. Jim Sciutto reports.
Ukraine prepares for fighting as Russian forces move weapons and troops into the country. Jim Sciutto reports.
CNN's Jim Sciutto reports on the collapsing ceasefire between Ukraine and pro-Russian separatists. Full story
Accusations Russia behind new Ukraine violence
Wolf Blitzer talks to Daniel Baer, U.S. Amb. to Org. for Sec. & Cooperation in Europe about the recent violence in the region.
President Obama is sending up to 1,500 more soldiers to Iraq to train Iraqi and Kurdish forces. Jim Sciutto reports.
President Obama sends a letter to Iran's Supreme Leader seeking cooperation against ISIS. Jim Sciutto reports.
400 Sunni tribesmen who had taken up arms against ISIS, were killed in the last 48 hours according to tribal leaders. Jim Sciutto reports.