A grand jury has cleared the police officer who fatally shot the man responsible for a car-and-knife attack at Ohio State University last year.

At issue were actions taken by OSU officer Alan Horujko (huh-RUJ'-koh) in November when he shot and killed 18-year-old attacker Abdul Razak Ali Artan.

Franklin County Prosecutor Ron O'Brien announced the grand jury results Wednesday.

Horujko killed the Somali-born Artan after he drove into a crowd outside a classroom building on Nov. 28 and then attacked people with a knife. Thirteen people were injured in the attack.

Authorities believe Artan's attack was partly inspired by an American-born cleric killed in a U.S. drone strike in Yemen.