A student shows a law enforcement officer a photo or video from his phone, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee)