A gunman reportedly opened fire on a country music concert outside the Mandalay Bay casino in Las Vegas, Nevada, on Sunday evening. Las Vegas Police have closed I-15 from Tropicana to Russell Road, and are asking people on the Strip to avoid the area. Reports indicate at least one gunman opened fire on crowds gathered for the Route 91 country music fest. Update 12:22 a.m. PDT: Reuters reports that 14 of those who arrived at area hospitals are “critically wounded”: Country music singer Jason Aldean was reportedly wrapping up his music set when the attack occurred. Video footage posted to...