COLUMBUS -- Investigators reviewing social media postings and other electronic communications by Abdul Razak Ali Artan said Wednesday they believe he could have been inspired by the Islamic State to carry out a knife attack at Ohio State University earlier this week.
But they stopped short of offering a definitive motive in the incident.
"We only believe that he may have been inspired by ISIL," Angela Byers, special agent in charge of the FBI's Cincinnati office, told reporters during a media briefing. She added, "They have been known to take credit for incidents like this when the assailant is deceased and can't refute that."
Byers and representatives of other law enforcement agencies offered an update on their investigation afternoon in Columbus.
On Monday morning, Artan drove his car into a crowd of people standing outside a building on the OSU campus, then exited the vehicle and stabbed people in the vicinity with a large knife. He was shot and killed by an OSU officer who was already on the scene responding to a gas leak.
Eleven people were injured in the attack; most were treated and released from hospitals, and none sustained life-threatening injuries.
Investigators confirmed Wednesday that Artan was a refugee from Somalia who came to the United States by way of Pakistan.
According to a university spokesman, he transferred to the campus from Columbus State Community College and was completing his first semester at OSU. He enrolled with 91 credit hours -- the threshold for senior status at OSU is 90 credit hours -- and was taking 14.5 credits of classes during the autumn term, majoring in logistics management.
Artan lived on the west side of the city, and investigators said he purchased a knife the morning of the attack, though they said they had not yet confirmed it was the same weapon used in the incident.
Investigators also said have conducted interviews with dozens of family members, co-workers, neighbors and others.
They declined many specifics, citing the ongoing nature of the investigation, which Byers said would be comprehensive and thorough with "an immense amount of local and federal resources being devoted" to it.
She added, "It will take time."
Byers said there have been no indications that others were involved in the incident.
"At this time, we are not aware of anyone else being involved in the planning of this attack," she said.
Investigators also said there was no indication that Artan knew any of the victims he attacked.
The vehicle he drove was registered to his brother.
Officials asked that anyone with knowledge of Artan and his whereabouts prior to Monday's attack to contact law enforcement.
Columbus Police Deputy Chief Michael Woods also urged residents to be on the lookout for other unusual activity.
"This can happen in New York City, it can happen in Columbus, Ohio, or it can happen to any small town," he said. "So what we're asking is if you see something that's unusual, let us know about it, call the FBI, call the Columbus Police, and we can follow up on that. And that's one more step that we can use to maybe prevent one of these attacks in the future."