Saturday's UFC 279 event between Khamzat Chimaev and Nate Diaz is still scheduled to take place in Las Vegas, but there was no pre-fight press conference on Thursday.
UFC President Dana White canceled the press conference and said it was a "s--t show" backstage, per Damon Martin of MMA Fighting. Martin noted it "sounds like there was some kind of altercation between the fighters that forced the format to change."
White went on to say "for everybody's safety, this is the right decision" and added, "I'm in very weird waters, this has never happened in the history of this company.