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TOPSHOT - Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018.
A gunman opened fire at the Florida high school, an incident that officials said caused "numerous fatalities" and left terrified students huddled in their classrooms, texting friends and family for help.
The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg        (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
TOPSHOT - Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018.
A gunman opened fire at the Florida high school, an incident that officials said caused "numerous fatalities" and left terrified students huddled in their classrooms, texting friends and family for help.
The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg        (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)

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911 calls reveal first few minutes of shooting

When a shooting erupted at Marjory Stoneman Douglas High School in Parkland, Florida, the first thing some students did was contact their parents. CNN's Alex Marquardt reports on the frantic first few minutes of the Florida school shooting.

911 calls reveal first few minutes of shooting

When a shooting erupted at Marjory Stoneman Douglas High School in Parkland, Florida, the first thing some students did was contact their parents. CNN's Alex Marquardt reports on the frantic first few minutes of the Florida school shooting.