. >> reporter: investigators now say 18-year-old faisal muhammad's stabbing spree could have been much worse. >> he had a pretty elaborate idea of what he wanted to do. >> that's based on what authorities say they found inside his backpack seen her next to the freshman where he was shot and killed by police. inside zip thailand cuffs, a night vision scope, safety hammer, two rolls of duct tape and two bas of petroleum jelly. >> the fortunate part his plan went hay wire because people fought back. >> they say he first burst into this building wednesday morning arched with a large knife and stabbed a student. that's when a construction worker rushed in to stop him. >> where did your son get stabbed. >> right at his belt line right here in front. not too far from the femoral artery. >> investigators say muhammad also targeted a second student and staff member before being taken down. his dorm roommate says he kept to himself. >> didn't talk much. and i mefr saw him walk with anybody. >> officers were seen rushing into their dorm wednesday guns drawnect collecting evidence and believe moha