“‘If I don’t make it, I love you”

Many students used their phones to keep their parents informed about what was happening, and to document some of the violence that was unfolding around them.

Sarah Crescitelli, a freshman, was in drama class rehearsing for a musical when gunshots rang out.

Hiding in a sweltering storage room with about 40 other students, she typed out a text message to her mother, Stacy, for what she thought might be the last time.

“If I don’t make it,” she wrote, “I love you and I appreciate everything you did for me.”

Another video shows students hiding in a classroom as armed officers enter. The students hold up their hands, some of them visibly trembling.

“Put your phones away!” one officer yells. “Put your phones away!”

A suspect described as a “troubled kid”

The young man who the authorities identified as the shooter, Mr. Cruz, previously attended Marjory Stoneman Douglas but was expelled after getting into trouble. He was…

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