FORT LAUDERDALE, Fla. — When Coral Springs police officer Gil Monzon arrived at Marjory Stoneman Douglas High School minutes after a gunman unleashed a massacre that killed 17, he says he found two Broward County sheriff’s deputies in the parking lot. He asked for the shooter’s location, and was told they didn’t know, but he could see a body next to the freshman building at Marjory Stoneman Douglas High School, and bullet marks in its third-floor windows.