Major Incidents | Mass Casualty Incidents | Slideshow

Fatal Shooting at Florida High School

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School Shooting Florida

In this frame grab from video provided by WPLG-TV, students from the Marjory Stoneman Douglas High School in Parkland, Fla., evacuate the school following a shooting there on Wednesday, Feb. 14, 2018. (WPLG-TV via AP)

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School Shooting Florida

In this frame grab from video provided by WPLG-TV, emergency personnel wheel an injured person from the Marjory Stoneman Douglas High School in Parkland, Fla., following a shooting there on Wednesday, Feb. 14, 2018. (WPLG-TV via AP)

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School Shooting Florida

In this frame grab from video provided by WPLG-TV, students from the Marjory Stoneman Douglas High School in Parkland, Fla., evacuate the school following a shooting, Wednesday, Feb. 14, 2018. (WPLG-TV via AP)

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School Shooting Florida

In this frame grab from video provided by WPLG-TV, students from the Marjory Stoneman Douglas High School in Parkland, Fla., evacuate the school following a shooting, Wednesday, Feb. 14, 2018. (WPLG-TV via AP)

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School Shooting Florida

In this frame grab from video provided by WPLG-TV, students from the Marjory Stoneman Douglas High School in Parkland, Fla., evacuate the school following a shooting, Wednesday, Feb. 14, 2018. (WPLG-TV via AP)

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School Shooting Florida

Anxious family members watch a rescue vehicle pass by, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School school sent students rushing into the streets as SWAT team members swarmed in and locked down the building. (AP Photo/Wilfredo Lee)

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School Shooting Florida

Family members embrace after a student walked out from Marjory Stoneman Douglas High School, Wednesday, Feb. 14, 2018, in Parkland, Fla. The shooting at the South Florida high school sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee)

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School Shooting Florida

A law enforcement officer talks with students, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee)

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School Shooting Florida

A student shows a law enforcement officer a photo or video from his phone, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee)

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APTOPIX School Shooting Florida

Parents wait for news after a reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (AP Photo/Joel Auerbach)

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School Shooting Florida

Anxious family members wait for information on students, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee)

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School Shooting Florida

Anxious family members wait for news of students as two people embrace, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. (AP Photo/Wilfredo Lee)

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APTOPIX School Shooting Florida

Medical personnel tend to a victim following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (John McCall/South Florida Sun-Sentinel via AP)

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APTOPIX School Shooting Florida

Medical personnel tend to a victim following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (John McCall/South Florida Sun-Sentinel via AP)

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CORRECTION APTOPIX School Shooting Florida

CORRECTS SPELLING TO MARJORY NOT MARJORIE Students are evacuated by police from Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018, after a shooter opened fire on the campus. (Mike Stocker/South Florida Sun-Sentinel via AP)