A FAN was knocked out cold as a mass brawl erupted at UFC Fight Night in Mexico City.
Supporters arrived at the Arena CDMX to watch the action taking place in the octagon.
But in shocking scenes, the mood for fighting spilled into the stands a mass punch-up began.
Several spectators swung fists at each other in the huge brawl towards the end of the night.
One fan was sparked out after he was caught by strong left hand.
He looked a little dazed and was then struck by the powerful punch, falling to the floor.
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The man soon got back up but looked unsteady on his feet in a ripped shirt.
There was still no sign of security when the fighting stopped.
UFC chief Dana White addressed the chaos, saying: "That was one of the craziest things I’ve ever seen.
"I don’t think it’s a bad look for the UFC. It happened and that was the end of that.
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"I think after everybody saw the end of that s***, nobody else wanted to try that again.
"The crazy thing about that fight is it went on forever.
"I went over and was watching it - no one stopped it.
"I was waiting for security to come in, they just let it go until it was over.
"I’ve never seen any s*** like that in my life.”
Back in the octagon, Brandon Royval beat Brandon Moreno in the main event.
There was also a win for Brian Ortega via submission against Yair Rodriguez.