Timeline of events leading up to attack emerges, amid claims police had trouble opening door of classroom where attacker had barricaded himself in
The Texas gunman who shot and killed 19 children and two teachers was inside the school for about 40 minutes before being killed by Border Control agents, officials have said, as onlookers spoke of their frustration at what they viewed as delays by law enforcement.
The first reports of an armed man approaching the school began to surface at about 11:30am on Tuesday. Just after 1pm, the 18-year-old was confirmed dead after he was shot inside the Robb Elementary School classroom in the small city of Uvalde.
