The Pentagon says it is considering quarantining all returning U.S. troops battling Ebola. CNN's Barbara Starr reports.
Barbara Starr reports that the U.S. military remains on high alert and ready to respond after the shootings in Canada.
NORAD is increasing its alert posture and number of planes ready to respond to a problem. CNN's Barbara Starr reports.
CNN's Barbara Starr reports on the violence in Yemen that could signal a new al Qaeda threat to the U.S.
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