UPDATE:
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Reports note students have barricaded classrooms:
According to numerous reports, an active shooter is on Ohio State's campus.
CNN is reporting that it is currently unknown whether there are injuries on campus, but a student heard "three or four" gunshots.
"My roommate and I heard about three or four gunshots from across the street, and soon after we heard a bunch of police and ambulances pull up across the street," the 19-year-old said.
"We can't see the building where the shooting happened because of a dorm blocking our view. It truly sounded like gunshots, and really soon after we heard a bunch of sirens. We can see the police cars from our dorm."
We'll continue to update this story.
