Knife-Wielding Ohio State University Student Shot Down

Abdul Razak Ali Artan plowed into pedestrians before exiting his car, slashing a few people with a butcher knife.
3:46 | 11/28/16

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Transcript for Knife-Wielding Ohio State University Student Shot Down
Good evening. And we're just back from our weekend reporting from Cuba, and we begin tonight with the breaking news right here at home. Shortly before 10:00 this morning, a campus-wide alert going out at Ohio state university. A suspect on the attack. The chilling warning in a tweet to run, hide, fight. A massive police response. The FBI joining in. Students barricading themselves in classrooms with whatever they could find. The suspect had rammed his car into a crowd of students, bystanders, then taking aim with a butcher's knife. There were multiple victims. The suspect was killed by an officer, and tonight, we know the attacker's identity. ABC's Alex Perez, leading us off from Columbus. Reporter: Tonight, a terrifying scene at Ohio state university. The chaos starting as the campus is coming to life. It's just before 10:00 A.M., the authorities say a male suspect in a car deliberately jumps a curb and plows into pedestrians. Fire department. This is osu. We have a vehicle that struck several pedestrians. Reporter: The driver then exits the car, carrying a butcher knife, and starts slashing people near the engineering building, Watts hall. Be advised, we got a man with a knife running around, cutting people. It looked like he was trying to hurt as many as he could. Reporter: A campus officer confronting him. He was yelling, and the guy could about stop. The guy charged the cop and the cop was forced to shoot him. Reporter: Just one minute after the attack begins, the cop firing the fatal shot that takes down the suspect. Seen here on the ground, surrounded by officers. Authorities tonight identifying the suspect as a student at osu, Abdul razak Ali artan. The school newspaper says this is his photo. Everybody was running in any direction they possibly could. I ran into a bathroom, luckily, it was just a single stall, I was able to lock myself in there. Reporter: The campus now on edge as authorities start hunting for a possible second suspect. The university tweeting, "Run, hide, fight, Watts hall." Starting to get texts that there was a shooter on campus, so, they locked the building down, had us go up to the third floor. Reporter: Some students barricading themselves inside classrooms, piling up chairs against the doors, as ambulances and fire trucks race in to treat the wounded. I need medics to macquigg lab as soon as possible. Severe bleeding on some of them. Reporter: 11 patients are rushed to local hospitals with stab wounds and injuries from being hit by that car. One in critical condition. The most police cars I've ever seen in one moment in my entire life. Reporter: FBI agents arrive with tactical units, including a S.W.A.T. Team and a bomb squad. And this terrifying warning. Law enforcement says parents should not call students who may be on campus, because their loved ones could be in hiding. A ringing phone could give them away. Then, in late morning, the all-clear. I tried to keep everybody calm. They did a really good job. I love my students. Reporter: As authorities tonight continue to investigation the crime scene, they now believe the sole perpetrator at the scene was artan, the student behind the wheel of this car. And are praising that campus officer, now identified as officer Alan horujko, who took him down. Our officer was onscene in less than a minute and he ended the situation in less than a minute. He engaged the suspect and he eliminated the threat. Acting very quickly there. Alex joins us tonight live from the scene there at Ohio state university. And Alex, you're learning more about that officer that took down the suspect? Reporter: That's right, David. We now know that officer is 28 years old and has been with the campus police force for less than two years. Authoritying says his quick action may have saved lives. David? Alex Perez leading us off tonight. Alex, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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