On May 24, a gunman fatally shot 19 children and two teachers in two adjoining classrooms at Robb Elementary School in Uvalde, Texas. Over an hour passed from the time officers followed the 18-year-old gunman into the school and when they finally entered the fourth-grade classroom where he was holed up and killed him.
Meanwhile, students trapped inside repeatedly called 911 and parents outside the school begged officers to go in.
