Virginia Tech officials told students to stay inside after a person with a gun was spotted near Dietrick Hall. The alert, posted on the school's Web site, was issued at 9:37 a.m.
Virginia Tech, located in Blacksburg, Va., endured a shooting rampage April 2007 that left 32 people dead and 25 injured.
The Associated Press reported that Dietrick Hall, a dining hall, is located a few steps from where the 2007 shooting took place.
Assistant Vice President of University Relations Larry Hincker said that three students attending a camp called in to report the gunman. Hincker said that the alert "is in effect until further notice. We are asking people to stay indoors until they hear from us again."
The three juveniles reported seeing a 6-foot-tall caucasian with light brown hair outside of New Residence Hall East. They said that he appeared to be holding a handgun and that the weapon was covered by a cloth. The students also said that the man was walking quickly toward the volleyball courts.
The man was described as wearing a blue-and-white striped shirt, gray shorts, and brown sandals. Officers were unable to find a man consistent with the description.
The alert is still in effect.