FORT LAUDERDALE — The Parkland shooter used a school computer to research how to make a nail bomb before carrying out his attack that killed 17 people, according to new witness statements released Wednesday.

Nikolas Cruz's computer searches in an engineering class caught the attention of a classmate interviewed by investigators after the shooting.

"He would look up strange things ... such as 666," the student recalled, adding, "It just made me feel very creeped out and scared."

The student who was interviewed the day after the Feb. 14 shooting at Marjory Stoneman Douglas High School said he sat next to Cruz during the previous school year.

In another statement, Giovana Cantone told investigators her daughter worked with Cruz at a Dollar Tree in Parkland last year. When Cantone went to the cashier last summer, Cruz rung her up, and she tried to console him for having been expelled from Stoneman Douglas. She told him her own daughter Ina had switched schools and was doing well, and he could consider a new school or even get his degree online.

"Thanks for the tip," he told her. "He says I can do that ... or he says I go shoot them."

"Don't talk like that, that's not good," she told him. "I didn't think he really meant it," she told investigators.

"I can go shoot them and you know I can shoot you, too," he told her.

Frightened, Cantone left the store.

She never reported the incident. "I let it go," she told investigators. "I'm sorry I did that."

Bruno Cardoso lived directly behind the Cruz family in Parkland when Cruz's mother was still alive. He told investigators Lynda Cruz was in the backyard, smoking, quite a bit, and Nikolas came outside in his underwear several times for target practice. He shot at cans, bottles and buckets.

Worried because he has a teenage daughter, he videotaped Cruz, to show a friend to confirm the silver gun might have been a BB gun.

Ina Cantone told investigators that Cruz seemed "off" and made high school girls uncomfortable when they came to the Dollar Tree and he tried to get their phone numbers. He confided to Ina Cantone once that he wanted a relationship because he was lonely.

"He didn't seem all that there in his head," she said.