The Law Library at UW-Madison was evacuated Wednesday morning and students were sent an alert asking them to avoid the area, after police got a report of a man with an AK-47 rifle.
The alert said "A man with a gun has been reported at the Law Library, avoid the area, everyone on campus should seek a safe location."
No suspect or gun had been found as of 12:05 p.m. and the "all clear" signal was given by 12:10 p.m.
The Dane County 911 Center said no ambulances, Madison police or fire or other law enforcement agencies had been called to respond to the scene.
The Law Library is on Bascom Hill in the original area of the campus.