Students trapped inside a classroom with a gunman repeatedly called 911 during this week’s attack on a Texas elementary school, including one who pleaded, “Please send the police now,” as officers waited in the hallway for more than 45 minutes, authorities said Friday. The commander at the scene in Uvalde — the school district’s police chief — believed that 18-year-old gunman Salvador Ramos was barricaded inside adjoining classrooms at Robb Elementary School and that children were no longer at risk, Steven McCraw, the head of the Texas Department of Public Safety, said at a contentious news conference. “It was the...