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The University of Pittsburgh in installing panic buttons in about 400 classrooms, the university announced Friday. The buttons will send an alert to the campus police and, in rooms with electronic locks, lock the door, enabling people to exit but not enter the room.

The safety measure comes in response to a “swatting” incident in April, in which emergency calls reported what ended up being a fake mass shooting in Pitt’s Hillman Library. Armed police swarmed the library, alarming students, who received no information about the phony calls until 90 minutes later.