Flags at half-mast in Washington DC following Vegas shooting

A member of the media takes video footage of the front of the Guns & Guitars store in Mesquite, Nev., Monday, Oct. 2, 2017. The stores general manager Christopher Sullivan said in a statement Monday that Stephen Craig Paddock showed no signs of being unfit to buy guns. Paddock killed dozens and injured hundreds Sunday night when he opened fired at an outdoor country music festival in Las Vegas. [Photo: AP/Chris Carlson]