The California college student who stabbed four people last fall in a campus spree that ended when he was killed by campus police had ISIS propaganda on his laptop and may have been “self-radicalized,” the FBI announced Thursday.

Faisal Mohammad, who carried out the attack at the University of California Merced on Nov. 4, 2015, had “pro-ISIL propaganda” on his laptop and “had visited ISIL and other extremist websites in the weeks prior to his attack,” according to the FBI’s Sacramento office.

“At the time of the stabbings, Mohammad was carrying a backpack which contained a two-page, hand-written plan detailing his intentions to include taking hostages and killing students and police officers. Investigators also found a photocopy of an ISIL flag and a list of items he thought he would need for an attack such as zip ties, glass breaker, and a knife among his belongings,” the FBI said in a statement.

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Image courtesy of University of California Merced