(NewsNation) — A spate of hoax calls about active shooters on U.S. college campuses is causing anxiety among students as the school year begins.

The calls have prompted universities to issue campuswide texts to “run, hide, fight.” Students and teachers have rushed to find cover, often cowering in classrooms for safety. Officers have swarmed campuses seeking out the falsified threats.

The hoax calls and false alarms have hit at least 11 college campuses from Arkansas to Pennsylvania.

On Monday alone, law enforcement responded to calls claiming there were active shooters at Arkansas, Northern Arizona University, Iowa State, Kansas State, Colorado University and the University of New Hampshire. More calls were made Tuesday at the University of Kentucky as well as Central Georgia Technical

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