A private guard was one of the first to confront a shooter
Students also tried to stop the attack
The motive remains a mystery
‘You never think this would be the new reality’
‘Our STEM family is hurting’
CNN’s Scott McLean, Amanda Watts, Steve Almasy, Chris Boyette, Kalenah Arif, Jamiel Lynch, Paul Murphy, Matt Hilk, Dave Alsup, Joe Sutton and Allison Flexner contributed to this report.
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