Virginia Tech was on lock down today after a gunman shot and killed a campus policeman during a routine traffic check. It is believed the gunman later turned the gun on himself. Though the lock down was lifted off the campus a few hours after the alleged gunman was found, officials are currently investigating the shooting. So far there is no motive for the shooting.This has been the second time the university has become the scene of a violent shooting since the 2007 killings of 33 students. Click below to hear more on the story from Rob Redding.