The gunman who killed 21 people at a Texas elementary school was in the building for over an hour before he was killed by law enforcement officers, authorities say. It was 11:28 a.m. when Salvador Ramos' Ford pickup slammed into a ditch behind the low-slung Texas school and the driver jumped out carrying an AR-15-style rifle. Twelve minutes after that, authorities say, 18-year-old Salvador Ramos was in the hallways of Robb Elementary School. Soon he entered a fourth-grade classroom. And there, he killed 19 schoolchildren and two teachers in a still-unexplained spasm of violence. STORY: https://www.ksdk.com/article/news/nation-world/texas-school-shooting-timeline-gunman-final-90-minutes-fuel-questions-police-delays/507-51bec11a-69d9-47dd-a90d-e9ceb9f044c6