Federal and local authorities investigating Monday's attack at Ohio State University do not believe anybody else was involved in the planning, other than deceased suspect Abdul Razak Ali Artan.
While ISIS has taken credit, FBI Special Agent Angela Byers says a direct connection to Artan has yet to be found.
A campus police officer fatally shot Artan shortly after the attack, which injured 11 people. Deputy Columbus police chief Michael Woods says Artan purchased a knife at a west side store early Monday, but investigators aren't sure he used it in the attack.
The Franklin County coroner's autopsy report shows Artan died of gunshot wounds to the head and chest, and says his death was a homicide.