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BLACKSBURG, Virginia (CNN) -- Police officers carrying rifles and wearing flak jackets responded to what turned out to be an unfounded threat Wednesday near the engineering building in which 31 people died Monday in the nation's deadliest shooting spree.
A state police officer told CNN "there was an unusual event at Burruss Hall, we responded, it was unfounded, and that's all we're going to say."
Another state police officer said the event involved a threat against university president Charles Steger.
Virginia Tech police said "we had reason to believe there was a need to secure the president's office" but would not elaborate. "It's over."
State police and an armored truck also responded to Burruss Hall, next to Norris Hall.