ALLEN, Texas (AP) — The mass shooting at a suburban Dallas shopping mall lasted three to four minutes before a local police officer shot and killed the gunman, authorities said Tuesday. The Allen police officer who shot and killed 33-year-old Mauricio Garcia acted heroically and saved “countless lives” through his quick action, Hank Sibley, the regional director of the Texas Department of Public Safety, said at a news conference. He said the officer is still processing what happened and isn’t ready to have his name made public. The investigation into Garcia's motive is ongoing, but he expressed neo-Nazi beliefs, Sibley...