Updated 11:07 a.m.: The press conference has started outside Burruss Hall with police chief Wendell Flinchum.
Flinchum says the alert is still in effect, but they have not found anyone matching the description.
Virginia Tech official Larry Hincker says he doesn't have an estimate of how many people are on campus at this time, he estimates around "a few thousand." This includes summer classes and summer camps.
The juveniles who reported seeing the gunman were part of the Higher Achievement Camp being held on campus.
Police are being "diligent" in searching campus and buildings.
Updated 10:45 a.m.: The Roanoke Times is reporting that police have found no trace of a gunman on Virginia Tech's campus.
"Police from Virginia Tech, Blacksburg and the Montgomery County Sheriff's Office searched the area and found no one fitting the man's description -- a white male wearing a blue and white striped shirt, gray shorts and brown sandals. Officers continue searching the area," the report says.
Updated 10:37 a.m.: Virginia Tech posted an updated alert on their website at 10:29 a.m., the alert says, "See VT homepage or email for further information on possible person with weapon. People on campus stay indoors until further notice."
The school website is now redirecting to a "Latest News" page, listing the report and description of the gunman:
"At 9:09 a.m. three juveniles attending a camp at the university reported seeing a white male, 6 feet tall, with light brown hair outside of New Residence Hall East holding what may have been a handgun. They say the weapon was covered by a cloth or covering of some sort. He was walking fast in the direction of the volleyball courts. He was wearing a blue and white striped shirt (stripes were vertical), gray shorts and brown sandals. The subject had no facial hair or glasses.
Officers responded immediately to the area but found no one matching the description. Police have encountered no other witnesses reporting this individual or anything suspicious. Law enforcement officers from VTPD, Blacksburg PD, Christiansburg PD, Virginia State Police, and Montgomery County Sheriff's Office are patrolling the campus, continuing to look for the subject.
If anyone sees anything suspicious contact the VT Police Department at 231-6411 or 911
Campus individuals should remain indoors."
Originial Report: The Washington Post is reporting that a person with a gun was seen on the campus of Virginia Tech this morning near Dietrick, a dining hall.
“Person with a gun reported near Dietrick. Stay Inside. Secure doors. Emergency personnel responding. Call 911 for help,” says an alert posted at 9:37 a.m. on the school website.
Patch will continue to follow this story as it unfolds.