A teenage gunman killed at least 19 children and two adults after storming into a Texas elementary school on Tuesday, the latest bout of gun-fuelled mass murder in the United States and the nation's worst school shooting in nearly a decade. The 18-year-old suspect, who was killed apparently by police, also had shot his own grandmother before fleeing from the scene, then crashing his getaway car and launching a bloody rampage at Robb Elementary School in...