A teenage gunman killed 18 young children in a shooting at an elementary school in Texas on Tuesday, in the deadliest US school shooting in years. The attack in Uvalde, Texas – a small community about an hour from the Mexican border \- is the latest in a spree of deadly shootings in America, where horror at the cycle of gun violence has failed to spur action to end it. Texas Governor Greg Abbott, addressing a news conference, said the 18-year-old gunman was believed to have shot his grandmother before heading to Robb Elementary School at around noon, abandoning his vehicle and entering with a …