and say they cannot rule out terrorism. >> we're always aware that that's the potential. we're going to continue to look at that. >> police say just before 10:00 a.m. artan jumped a curb ramming a car into a group of pedestrians. >> he exited the vehicle and used a butcher knife to start cutting pedestrian. >> a guy ran a car through a crowd of students, he did it purposefully. >> i'm at ohio state. a guy crashed his car into a bunch of people. >> we need an ambulance here fast. >> a minute into the attack osu police officer alan horusko arrived at the scene, shot him three times and killed him. >> the officer engaged the suspect and fired shots and used deadly force to stop the threat. >> 11 people wounded in the attack. all are expected to survive as the attack unfolded, students barricaded doorways to avoid