JOHN FURY punched and HEADBUTTED a glass wall in a bid to get to KSI.

KSI and John's son Tommy put bragging rights, reputations, and unbeaten records on the line Saturday night in Manchester.

To prevent tensions from boiling over between the two, a cage featuring a perspex glass wall was put between the pair to separate them.

And after some words were exchanged Tommy exited and dad John entered to give KSI a piece of his mind.

John proceeded to give the barrier a one-two combination.

He also went as far as HEADBUTTING the glass that separated the two fighters.

John failed to break through, with KSI holding his ground.

Those in the audience could be heard shouting "Break the cage".

John was eventually ushered out by security.

Tensions also boiled over during Wednesday's open training session when John threw a bottle at KSI, prompting the YouTuber and rapper to SPIT at him.

Among the chaos, a furious KSI appeared to ask: "Are you f***ing disrespecting me?"

The enraged father of Tommy then repeatedly yelled: "Come down here!"

He then added: "F*** off."

KSI quickly turned his attention back to Tommy, who wagged his finger at his rival.

John then launched an attack on Jake and Logan Paul's dad, Greg.

In footage captured by DAZN, Fury could be seen exchanging fierce words with Paul behind the scenes.

He was then held back as he tried to charge at the American, who was led away.

Tommy Fury takes on KSI in a huge Misfits boxing event on Saturday.

YouTuber Logan Paul takes on MMA star Dillon Danis on the night.