Mandalay Bay Hotel/Casino. Reports are gun shots coming from rooftop. Developing news. All foggy news caveats apply. http://abc7.com/las-vegas-police-responding-to-shooting-report-at-mandalay-bay/2477628/ LAS VEGAS (KABC) -- Las Vegas authorities are responding to reports of a mass shooting with multiple victims on the Strip at a country music festival near the Mandalay Bay. Police are investigating reports of one or more active shooters in the area. One Las Vegas hospital reported treating at least 20 victims with gunshot wounds.