Here is what we know so far about the victims, including those who are dead, injured, or who have gone missing in the aftermath. Business Insider will add to this report as more information becomes available.
Martin Duque, pictured on the right of the photo above, was confirmed dead by his brother early on Thursday morning.
Miguel Duque posted on Instagram, and said: "Words can not describe my pain. I love brother Martin you’ll be missed buddy. I know you’re in a better place."
Aaron Feis, a football coach, was shot while protecting a student from the shooter. Local media say he has since died.
Several people remain missing in the aftermath of the shooting. Local media has named some of them.
The family and friends of at least eight students have appealed for news on their whereabouts.
Meadow Pollack, an 18-year-old senior pictured above, was missing. As of Wednesday evening, her family was awaiting news of her whereabouts.
Her father, Andrew Pollack, told the Sun Sentinel: "Her phone, she don't answer. She would have picked up her phone by now.
"No one knows where she is. We're all sick over this and just praying."
Alyssa al Hadeff, a 15-year-old freshman, was also missing. Her grandmother, Vicky al Hadeff, told South Florida's WSVN news station she visited several hospitals in the area for the teen and was fearing the worst.
Parents veer between hope and anguish as they await word from teens missing since the #school shooting at Marjory Stoneman Douglas High in Parkland https://t.co/KPkgD79VGV Photo: Meadow Pollack, with a relative, courtesy Pollack family pic.twitter.com/UbUQl0lHgX
Luke Hoyer, a 15-year-old freshman, was also reported missing by the Miami Herald. As of Thursday morning, his parents were waiting at a Marriott hotel in Coral Springs, where students were transported after the shooting.