A deluge of 911 calls. Are there multiple shooters on the Las Vegas strip? So many wounded, so many killed. Las Vegas Metro PD has officers down. A cop drags his bleeding partner to safety. Between bursts of automatic gunfire, concertgoers make a run for it if they can. SWAT officers converge on the Mandalay Bay Hotel. They now know the shooter is on the 32nd floor. Squinting through rifle scopes, they stage an assault.