Columbus, OH - An 18-year-old Somali immigrant has been identified as the suspect behind the gruesome attack Monday on the Ohio State University campus.

The alleged attacker, Abdul Razak Ali Artan, was killed by police, but not before driving a car into a group of people and then attacking victims with a butcher's knife, said Monica Moll, public safety director at Ohio State. FBI agents had joined local police in investigating the incident. Nine people were injured, and all are expected to survive

Artan, who was a student at Ohio State, was born in Somalia and living in the United States as a legal permanent resident, according to multiple news outlets, citing unidentified law enforcement officials. It was unclear when Artan came to the U.S.

Ohio State Police Chief Craig Stone said that Artan was alone during the attack and that police were still trying to determine the motive of the attack. Ohio State officials said the quick action of Officer Alan Horujko, who fatally shot Artan, prevented more people from being injured in the incident.

"We can prove to you that the suspect was by himself in the vehicle and committed this act by himself today," Stone said. "It's an ongoing investigation to determine motive and if anybody else was involved in this act."

Columbus Police Chief Chief Kim Jacobs, whose officers also responded to the attack, said terrorism had not been ruled out. "That's why our federal partners are here and helping," she said.