Broward Deputy Scot Peterson stands safely behind a concrete wall taking no action as high school students lay dead and wounded just feet away, newly released video of the Florida school shooting shows. The Broward Sheriff’s Office released the 27-minute video Thursday of the former longtime resource officer responding to initial reports of a shooting at Marjory Stoneman Douglas High School on Feb. 14. Peterson, who was assigned to the school and on site when the shooting began, is seen with a civilian security monitor at the start of the video, but spends most of the video standing outside the...