Rescue workers prepare to transport a victim on a stretcher near Marjory Stoneman Douglas High School following a shooting incident in Parkland

Rescue workers prepare to transport a victim on a stretcher near Marjory Stoneman Douglas High School following a shooting incident in Parkland, Florida, U.S. February 14, 2018 in this still image taken from a video. WSVN.com via REUTERS. ATTENTION EDITORS – THIS IMAGES HAS BEEN PROVIDED BY A THIRD PARTY. NO RESALES, NO ARCHIVES. MANDATORY CREDIT. NO ACCESS SOUTHEAST FLORIDA MEDIA.