 "Photo: Matt Gentry, The Associated Press/The Roanoke Times,")
4:22 p.m.: State police: Va. Tech shooter was not the person pulled over during traffic stop
3:41 p.m.: Va. Tech says there is no longer a threat on campus, says normal activities can resume
3:36 p.m.: Law enforcement official tells AP that Virginia Tech gunman is believed to be dead.
2:31 p.m.: Virginia Tech officials say a police officer and another person have been shot and killed on the school's campus.
The suspect remains on the loose.
A news release from the school says the police officer had pulled someone over in what was a routine traffic stop Thursday. The officer was shot and killed during the traffic stop.
Witnesses told police the shooter ran toward a parking lot on campus. A second person was found dead in that parking lot.
Virginia State Police will be taking over the investigation, according to the news release.
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