Emotions between UFC light-heavyweight champion and Jon Jones and challenger Daniel Cormier boiled over today at a UFC 178 pre-fight press conference this afternoon in Las Vegas.

At the MGM Grand, the fisticuffs appeared to be started via an incidental headbutt from Jones, followed by a Cormier pushoff.

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The two have been waging a social media war primarily on Twitter prior to the incident.


According to the UFC report, security and UFC officials broke things up with Jones tweeting afterwards:

And Cormier firing back:

And finally Jones:

UFC 178 takes place September 27th at the MGM Grand Garden arena in Las Vegas.

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