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COLLEGE PARK, Md. (WUSA9) -- Campus police responded to an anonymous report of criminal activity at the University of Maryland on Wednesday.

At about 3:27 p.m. the University received an anonymous phone call informing them there was an individual holding a hostage at gunpoint in the main administrative building, the University of Maryland said.

An all clear was given within an hour of the initial warning to stay clear of the building.

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