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Trying to understand the loner Florida shooter

Aerial view of Marjory Stoneman Douglas High School
People wait for loved ones outside Marjory Stoneman Douglas High School. Photo: Joe Raedle / Getty Images

"The suspect in a deadly rampage at a Florida high school is a troubled teenager who posted disturbing material on social media before the shooting spree," AP reports.

His background: Nikolas Cruz, 19, had been expelled from Marjory Stoneman Douglas High School for "disciplinary reasons."