PARKLAND, Fla. (AP) — Students and neighbors describe the suspect in the deadly rampage at a Florida high school as a troubled teenager who threatened and harassed peers, talked about killing animals, posed with guns in disturbing photos on social media, and bragged about target practice in his backyard with a pellet gun.

Nikolas Cruz, 19, had been expelled from Marjory Stoneman Douglas High School for "disciplinary reasons," Broward County Sheriff Scott Israel said, but he insisted he didn't know the specifics. Math teacher Jim Gard told the Miami Herald that before Wednesday's fatal shooting of 17 people, Cruz may have been identified as a potential threat - Gard believes the school had sent out an email warning teachers that Cruz shouldn't be allowed on campus with a backpack