FILE - In this Feb. 14, 2018 file photo, students hold their hands in the air as they are evacuated by police from Marjory Stoneman Douglas High School in Parkland, Fla., after a shooter opened fire on the campus. Emergency calls from parents and students during the Florida high school massacre show 911 operators at first trying to grasp the enormity of the emergency and then calmly trying to gather information to assist arriving law enforcement officers. The officers arrive to find chaos as delays allowed the shooter to flee. (Mike Stocker/South Florida Sun-Sentinel via AP, File)
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