LAS VEGAS SLIDER5 WASHINGTON, DC - OCTOBER 02: U.S. flags on the grounds of the Washington Monument are lowered to half-staff, on October 2, 2017 in Washington, DC. President Donald Trump ordered the flags on all federal buildings to fly at half-staff following the mass shooting that left more than 50 dead in Las Vegas. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, allegedly opened fire from the Mandalay Bay Resort and Casino on an outdoor music festival. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by Mark Wilson/Getty Images)