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After Tuesday's school shooting in Georgia where no one was killed or injured, Brian Todd looks into what measures schools have taken to protect students from shootings and how effective they have been.
News that broke in The Situation Room: Police say the man who opened fire inside an elementary school gained entry by following someone past the locked doors. CNN's David Mattingly reports live from the scene.
Police in Georgia continue their search for a man who witnesses say pointed a rifle at a school bus.
RELATED STORY: Georgia police hunt man who pointed rifle at school bus