Story highlights Authorities are trying to fill in details about what happened Monday morning

The FBI says Abdul Razak Ali Artan may have been inspired by ISIS

(CNN) Where was Ohio State University attacker Abdul Razak Ali Artan on Monday before he rammed his car into a group of people on the school's campus and charged at passersby with a knife?

That's a question authorities are trying to answer, and they're seeking the public's help.

"While we know several details about his travels that morning, we want to fill in any time that is not accounted for," FBI Special Agent in Charge Angela Byers told reporters Wednesday.

One detail they know is that Artan bought a knife at a Walmart on Monday morning, Columbus Police Deputy Chief Mike Woods said.

"That time between the purchase and his arrival on campus, we want to fill in," Woods said.

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