WBRZ - Baton Rouge

BLACKSBURG, Va. - State police say the gunman who killed a police officer at Virginia Tech appears to have walked into a parking lot and shot the officer during a traffic stop.

Sgt. Robert Carpentieri says it appears that the shooter also was not in the car that was pulled over on Thursday.

The sergeant says another officer later spotted a second person in a parking lot who was alive at the time. That person later died.

The shooting triggered a lockdown on the sprawling campus that in 2007 was the scene of the deadliest mass shooting in U.S. history.

Image Courtesy: Collegiate Review/Daniel Lin