The Ohio State University campus has been cleared and the suspect behind Monday's violent attack has been killed by police, leaving many unanswered questions.

Here's what we do know about the suspect:

According to NBC News, the suspect has been identified as 20-year-old Abdul Razak Ali Artan. Artan was an Ohio State student and Somali refugee. He left his homeland with his family for Pakistan in 2007. In 2014, he became a permanent U.S. citizen, NBC News reports.

Artan allegedly drove a vehicle into a crowd of students after Watts Hall was evacuated due to a fire alarm. Witnesses say he jumped out of the car and began slashing and stabbing people with a large butcher knife before he was shot and killed by police.

Nine students were hospitalized, but none suffered life-threatening injuries, according to the Associated Press.

Artan's motive remains unclear, but officials tell NBC News that the attack was intentional and possibly pre-meditated.

Earlier this year, Artan was featured in The Lantern, Ohio State's official student newspaper:

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Stay with as more information becomes available.