50+ DEAD AT VEGAS CONCERT MACHINE GUN SNIPER
MASSACRE AT MANDALAY BAY HOTEL...GUNMAN FIRES FROM 32ND FLOOR...BULLETS RAIN DOWN FOR 10 MINUTES...VIDEO: SHOT AFTER SHOT AFTER SHOT...CONCERTGOERS RUN FOR LIVES...SINGER FLEES STAGE...SUSPECT NAMED... 'HE SNAPPED'...KILLS SELF BEFORE ARREST...…