Part 12/15:
Investigators found an IS flag in his apartment and believe he was radicalized online over a short period. The attacker reportedly pledged allegiance to IS, and authorities suspect a terrorist motive. An incident in which a delivery worker—a fellow Syrian—intervened and thwarted the attack prevented further casualties. The suspect held a valid residence permit and was not previously on law enforcement watch lists, complicating efforts to preempt the attack.