As many as 20 colleges and universities across the U.S. have been targets of active shooter reports that turned out to be false.

On Tuesday morning, the University of Maryland joined that group.

According to Lt. Rosanne Hoaas, public information officer with the University of Maryland Campus Police, the department was notified by Prince George’s County Public Safety Communications that there was a report of an active shooter near McKeldin Library around 4:15 a.m.

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