PARKLAND, Fla. (AP) — Months before authorities say Nikolas Cruz walked into his former high school and slaughtered 17 people, the troubled teen began showing what may have been warning signs he was bent on violence.

“Im going to be a professional school shooter,” a YouTube user with the screen name “Nikolas Cruz” posted in September.

The 19-year-old got expelled last year from Marjory Stoneman Douglas High School for undisclosed disciplinary reasons. And less than a year ago, the former Junior ROTC cadet bought a military-style AR-15 rifle.

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