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A man who injured 11 people, one critically, in a rampage at Ohio State University was of Somali descent and a student on campus, say US officials.
Abdul Razak Ali Artan, 18, rammed his car into a group of pedestrians at the college then got out and began stabbing people before police shot him dead.
Police Chief Kim Jacobs said they were investigating whether Monday morning's incident was a terrorist attack.
The FBI joined the inquiry at the 60,000-student campus in Columbus.
Image caption Officer Alan Horujko, 28, shot dead the attacker Artan was a Somali refugee who was living in the US as a legal permanent resident, US media report.
Asked at a news conference whether it could have been a terrorist act, Police Chief Jacobs said: "I think we have to consider that it is."
She added: "Obviously with the purposeful intent that was noticed - driving on the sidewalk - we're going look at it from the potential that it was planned."
Artan studied logistics management in the college of Business at Ohio State, reports the Columbus Dispatch.
Image copyright AP Image caption Police say the attacker drove this car into a crowd before continuing his attack with a knife Jump media player
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Media captionEyewitness: "I saw three or four students being hit" The incident began at 10:00 local time on Monday when a vehicle jumped the kerb at the campus, striking pedestrians near Watts Hall, the science and engineering building.
Ohio State Police Chief Craig Stone said the driver got out of the vehicle and began stabbing bystanders with a "butcher's knife".
A policeman who was nearby because of a gas leak shot the driver dead in less than a minute.
Image copyright ABC Image caption Students barricade a classroom door amid the campus lockdown at Ohio State University Authorities identified the officer as 28-year-old Alan Horujko, who has been with Ohio State University police since 2015.
The injured included a mix of academic faculty, maintenance staff, and graduate and undergraduate students.
Campus police say that CCTV cameras filmed the suspect arriving on campus alone, indicating that he did not have an accomplice aiding him during the attack.
Student Martin Schneider said he heard the car's engine revving.
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Media captionWould we reduce the incentive to commit a mass shooting if we refused to report the killer? "I thought it was an accident initially until I saw the guy come out with a knife," he said.
The college had warned students in a tweet to "Run Hide Fight", warning there was an "active shooter", though authorities later said the attacker did not use a firearm.
Hours later police declared the scene "secure", lifting the shelter-in-place order and cancelling classes for the remainder of Monday.
Columbus Police sent a SWAT team, dog units, negotiators and a helicopter to the scene.
Image copyright AP Image caption Ohio State University is one of the largest in the US Federal officials from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives also responded.
Abdul Razak Ali Artan, 18, rammed his car into a group of pedestrians at the college then got out and began stabbing people before police shot him dead.
Police Chief Kim Jacobs said they were investigating whether Monday morning's incident was a terrorist attack.
The FBI joined the inquiry at the 60,000-student campus in Columbus.
Image caption Officer Alan Horujko, 28, shot dead the attacker Artan was a Somali refugee who was living in the US as a legal permanent resident, US media report.
Asked at a news conference whether it could have been a terrorist act, Police Chief Jacobs said: "I think we have to consider that it is."
She added: "Obviously with the purposeful intent that was noticed - driving on the sidewalk - we're going look at it from the potential that it was planned."
Artan studied logistics management in the college of Business at Ohio State, reports the Columbus Dispatch.
Image copyright AP Image caption Police say the attacker drove this car into a crowd before continuing his attack with a knife Jump media player
Media player help
Out of media player. Press enter to return or tab to continue.
Media captionEyewitness: "I saw three or four students being hit" The incident began at 10:00 local time on Monday when a vehicle jumped the kerb at the campus, striking pedestrians near Watts Hall, the science and engineering building.
Ohio State Police Chief Craig Stone said the driver got out of the vehicle and began stabbing bystanders with a "butcher's knife".
A policeman who was nearby because of a gas leak shot the driver dead in less than a minute.
Image copyright ABC Image caption Students barricade a classroom door amid the campus lockdown at Ohio State University Authorities identified the officer as 28-year-old Alan Horujko, who has been with Ohio State University police since 2015.
The injured included a mix of academic faculty, maintenance staff, and graduate and undergraduate students.
Campus police say that CCTV cameras filmed the suspect arriving on campus alone, indicating that he did not have an accomplice aiding him during the attack.
Student Martin Schneider said he heard the car's engine revving.
Jump media player
Media player help
Out of media player. Press enter to return or tab to continue.
Media captionWould we reduce the incentive to commit a mass shooting if we refused to report the killer? "I thought it was an accident initially until I saw the guy come out with a knife," he said.
The college had warned students in a tweet to "Run Hide Fight", warning there was an "active shooter", though authorities later said the attacker did not use a firearm.
Hours later police declared the scene "secure", lifting the shelter-in-place order and cancelling classes for the remainder of Monday.
Columbus Police sent a SWAT team, dog units, negotiators and a helicopter to the scene.
Image copyright AP Image caption Ohio State University is one of the largest in the US Federal officials from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives also responded.
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