Wladimir Klitschko has called for action to be taken following the "embarrassing and disgraceful" brawl between British heavyweights David Haye and Dereck Chisora.
The two men scrapped at the post-fight press conference following Chisora's unanimous decision defeat by Klitschko's brother Vitali, the WBC champion, in Munich on Saturday night.
Haye punched Chisora, traded blows with Chisora's trainer Don Charles and then tried to hit Charles with a camera tripod.
Chisora, meanwhile, told Haye: "I'm going to shoot you", while also involving himself in the scuffle.
Chisora had already incurred the wrath of the WBC for slapping Klitschko at Friday's weigh-in and was similarly ill-behaved on fight night.
Wladimir Klitschko, the IBF, WBO and WBA champion, has history with both men having beaten Haye last summer and twice pulled out of bouts with Chisora citing injury.
And he has reiterated his disgust at Saturday's events, which he witnessed first hand.
"I am shocked and deeply embarrassed by the actions of Dereck Chisora and his team over this past week," the 35-year-old said in an open letter.
"It saddens me how he represented the sport of boxing and disrespected the champion of the world Vitali Klitschko at the weigh-in and fight night.
"But even more embarrassing and disgraceful to the sport was the post-fight press conference.
"With journalists from all over the world in attendance, this same man, Dereck Chisora, got into a fight with Adam Booth, the trainer of David Haye, and David Haye himself.
"Dereck then promised out loud multiple times right in front of the press to 'personally shoot and kill David Haye!'
"For all of the great champions from the past that have been polishing the image of the sport of boxing and giving it the glamour, respect and recognition while setting a good example for the youth of the world to follow, this type of behaviour kills all that hard work from the former champs and teaches disrespect for the sport and fellow human beings."
Klitschko added: "There has to be consequences for these kinds of actions and must never be tolerated by the boxing organizations, the media, fellow boxers and boxing fans. It must be stopped, otherwise the sport of boxing is going to go downhill fast.
"I just wanted to share my feelings and thoughts with you and hope some type of action is taken to show the world that the sport of boxing will not tolerate this kind of behavior."