A stampede following the Floyd Mayweather Jr.-Marcos Maidana title fight injured dozens at the MGM Grand in Las Vegas.
That was the scene inside the famed casino Saturday after undefeated boxer Mayweather beat Maidana in front of a sold-out crowd of more than 16,000 people.
The Las Vegas Sun reports spectators thought they heard gun shots ring out inside the casino's Garden Arena, but the loud bang was actually triggered by a fallen wall.
The bang sent thousands stampeding toward the exits, trampling several in the process. Witnesses painted a terrifying scene.
Spectators posted dozens of videos on social media, including this one from Rick Rogers.
MGM released a statement Sunday saying, "Safety is always a priority at our resort. We are investigating the situation thoroughly to understand more completely what occurred, to assist those affected, and to ensure further safety precautions."
At least 50 people were treated for injuries at the scene, while two dozen others were taken to local hospitals.