Virginia Tech was in shock Friday after a school police officer and another person were shot dead in a chaotic scene on the campus where the deadliest school shooting in US history unfolded in 2007.
Police refused to confirm reports that the second fatality might have been the shooter himself, as the 31,000-student university lifted an afternoon-long lockdown and declared there was no longer an "active threat" late Thursday.
But when asked if the gunman was at large, Virginia State Police spokesperson Bob Carpentieri cryptically told reporters: "Investigators feel confident that they have located the person."
Slain police officer Deriek Crouse, 39, was shot and killed in a parking lot.
"Tragedy again struck Virginia Tech in a wanton act of violence where police officer, Deriek Crouse, was murdered during a routine traffic stop," university president Charles Steger said in a statement.