Armed with an AR-15, Nikolas Cruz, 19, returned to the school that had expelled him the year before for disciplinary reasons. Shortly before the end of the school day, he set off a fire alarm to draw students out of classrooms and opened fire, killing at least 17 children and adults. At least an additional 15 were also injured during the attack. Cruz blended himself into the student crowd to escape; he was taken into custody an hour later. Authorities immediately charged him with 17 counts of premeditated murder. Marjory Stoneman Douglas High School is located in affluent Parkland, Florida and is one of the largest schools in Broward County. The shooting on the sprawling campus happened despite the presence of police officers at the school. Parkland has been rated one of the safest communities in America.