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, after a gunman opened fire on the campus. A commission later concluded that a slow law enforcement response was a contributing factor to the resulting deaths and injuries. (Mike Stocker/South Florida Sun-Sentinel via AP, File) (Mike Stocker/AP)