This is the update from the Virginia Tech website:
Shortly after noon today, a Virginia Tech police officer stopped a vehicle on campus during a routine traffic stop in the Coliseum parking lot near McComas Hall
During the traffic stop. the officer was shot and killed. There were witnesses to this shooting.
Witnesses reported to police the shooter fled on foot heading toward the Cage, a parking lot near Duck Pond Drive. At that parking lot, a second person was found. That person is also deceased.
Several law enforcement agencies have responded to assist. Virginia State Police has been requested to take lead in the investigation
The status of the shooter is unknown. The campus community should continue to shelter in place and visitors should not come to campus.
The shooting came the same day as Virginia Tech, which has an enrollment of about 30,000, was appealing a $55,000 fine by the U.S. Education Department in connection with the university's response to the 2007 rampage, when a student gunman killed 32 students and faculty and then shot himself.
Online: Virginia Tech website