Virginia State Police Lt. Joe Rader said Wednesday authorities believe 20-year-old Morgan Dana Harrington of Roanoke was last seen at 9:30 p.m. on Oct. 17 on a bridge that crosses railroad tracks in Charlottesville.
Harrington had gone to the University of Virginia for a Metallica concert, but left the arena and was denied re-entry under arena policy.
Rader said witnesses saw someone matching Harrington's description around the outside of the arena from about 8:20 p.m. until 9 p.m. She then was seen walking across two parking areas.
She last was seen at 9:30 p.m. walking on the Copeley Road bridge, which is near one of the parking areas where Harrington's purse and cell phone were found the next day.
"Somewhere out there lies the vital link of information that we need," Rader told a news media briefing.
Police asked anyone to contact them who saw Harrington getting into a vehicle or who saw a vehicle parked randomly on Copeley Road that night.
UVA police said they would step up security measures Saturday, when the school has a home football game and Halloween festivities are planned. Campus police plan increased patrols on foot and in vehicles.