Police officers and students are seen outside STEM School Highlands Ranch, a charter middle school in the Denver suburb of Highlands Ranch, Colo., after a shooting Tuesday, May 7, 2019. (Courtney Harper via AP)
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A parent leads a child from a recreation center set up for students to get reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Police and others are seen outside STEM School Highlands Ranch, a charter middle school in the Denver suburb of Highlands Ranch, Colo., after a shooting Tuesday, May 7, 2019. Authorities said several people were injured and a few suspects were in custody. (AP Photo/David Zalubowski)
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Parents head into a recreation center for students to get reunited with their parents after a shooting Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Parents hug as they wait for the arrival of their children at the recreation center where the students were reunited with their parents Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Armed police officers and others are seen outside STEM School Highlands Ranch, a charter middle school in the Denver suburb of Highlands Ranch, Colo., after a shooting Tuesday, May 7, 2019. Authorities said several people were injured and a few suspects were in custody. (Courtney Harper via AP)
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Parents hug as they wait for their children at the recreation center where students were reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Parents gather in a circle to pray at a recreation center where students were reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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A parent leaves the recreation center where students were reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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A man carries a child out of a recreation center set up for students to get reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Students exit an ambulance at a recreation center for students to get reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Parents leave a recreation center with their child where students were reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Parents hug as they wait for their children at a recreation center where students were reunited with their parents Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Fire and police gather at the recreation center where students were reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Shooting scene at STEM School Highlands Ranch
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A law officer protects a busload of students as a bus arrives at the recreation center where students were reunified with their parents Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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A woman heads into a recreation center for students to get reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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A woman runs to a recreation center set up for students to get reunited with their parents after a shooting at a suburban Denver middle school Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Shooting scene at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Parents fight back tears as they wait for their children at a recreation center where students were reunited with their parents Tuesday, May 7, 2019, in Highlands Ranch, Colo. (AP Photo/David Zalubowski)
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Shooting reported at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Shots have been fired at STEM School Highlands Ranch at South Ridgeline Boulevard and Plaza Drive
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Shooting reported at STEM School Highlands Ranch
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Shots have been fired at STEM School Highlands Ranch at South Ridgeline Boulevard and Plaza Drive
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Shots have been fired at STEM School Highlands Ranch at South Ridgeline Boulevard and Plaza Drive
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Shooting reported at STEM School Highlands Ranch
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Shooting reported at STEM School Highlands Ranch
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Shooting reported at STEM School Highlands Ranch
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Shooting scene.
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Shooting scene at STEM School Highlands Ranch
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Shooting scene at STEM School Highlands Ranch
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Armed police officers and others are seen outside STEM School Highlands Ranch, a charter middle school in the Denver suburb of Highlands Ranch, Colo., after a shooting Tuesday, May 7, 2019. Authorities said several people were injured and a few suspects were in custody. (Courtney Harper via AP)
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Armed police officers are seen outside STEM School Highlands Ranch, a charter middle school in the Denver suburb of Highlands Ranch, Colo., after a shooting Tuesday, May 7, 2019. Authorities said several people were injured and a few suspects were in custody. (Courtney Harper via AP)
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Armed police officers and others are seen outside STEM School Highlands Ranch, a charter middle school in the Denver suburb of Highlands Ranch, Colo., after a shooting Tuesday, May 7, 2019. (Courtney Harper via AP)