December 8, 2011
Police officers block a road on the Virginia Tech campus in Blacksburg, Va., after a gunman killed a police officer and another person Thursday, Dec. 8, 2011. The school said a police officer pulled someone over for a traffic stop and was shot and killed. The shooter ran toward a nearby parking lot, where a second person was found dead. (AP Photo/The Roanoke Times, Matt Gentry)
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A law enforcement official says the gunman who fled after killing a police officer on campus is believed to be dead.