A news conference between WBC world heavyweight champion Deontay Wilder and Tyson Fury descended into chaos three days before their fight.
The pair began pushing during a face off before their teams got involved, prompting 60 seconds of mayhem.
Fury removed his shirt as security intervened, before the duo and their entourages were cleared from the stage.
The men are to fight at the Staples Centre in Los Angeles on Saturday 1 December.