"Investigators developed information that he may have self-radicalized and drawn inspiration from terrorist propaganda. His laptop contained pro-ISIL propaganda, and he had visited ISIL [Daesh] and other extremist websites in the weeks prior to his attack," the statement published Thursday read.
The agency added that Mohammad had begun preparations for the attack a week in advance, writing down a two-page plan detailing his intentions, including taking hostages, killing students and police officers.
The assailant had a flag of Daesh, a group outlawed in the United States and Russia, among other states, in his backpack, according to the FBI.
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