Slideshow | Terrorism & Active Shooter

Emergency Response to Ohio State Active Shooter

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Emergency Response to Ohio State Active Shooter

Students walk on campus at Ohio State University as police respond to an attack on Monday, Nov. 28, 2016, in Columbus, Ohio. (Adam Cairns/The Columbus Dispatch via AP)

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Emergency Response to Ohio State Active Shooter

Crime scene investigators collect evidence from the pavement as police respond to an attack on campus at Ohio State University, Monday, Nov. 28, 2016, in Columbus, Ohio. (AP Photo/John Minchillo)

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Emergency Response to Ohio State Active Shooter

Student Nicholas Flores reacts as police respond to an attack on campus at Ohio State University on Monday, Nov. 28, 2016, in Columbus, Ohio. Multiple people were injured in the attack and a suspect was shot, school and hospital officials said. (Adam Cairns/The Columbus Dispatch via AP)

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Emergency Response to Ohio State Active Shooter

SWAT teams and police respond to reports of a shooting on campus at Ohio State University, Monday, Nov. 28, 2016, in Columbus, Ohio. (AP Photo/John Minchillo)

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Emergency Response to Ohio State Active Shooter

Police respond to reports of a shooting on campus at Ohio State University, Monday, Nov. 28, 2016, in Columbus, Ohio. (AP Photo/John Minchillo)

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Emergency Response to Ohio State Active Shooter

Police respond to an attack on campus at Ohio State University, Monday, Nov. 28, 2016, in Columbus, Ohio. (AP Photo/John Minchillo)