This shocking video shows two prisoners squaring off in a brutal fist fight that leaves one of the men covered in blood.

The footage, captured on a banned mobile phone, shows the two inmates locked in the no-holds-barred brawl in a cell in HMP Rochester, Kent.

The prisoners punch and grapple with each other in the dark room as half a dozen others look on, keeping an eye out for the 'screws'.

Brawl: The inmate in the blue prison uniform launches into the room, grabbing his shirtless opponent

The video was uploaded to YouTube on December 23 with the caption, 'gypsy boy fighting bigger weight & gypsy boy wins'.

At the start of the video, one of the men inside the cell asks those standing on the corridor outside to 'tell us if the screws come' as another says, 'we need a fair fight'.

The challenger, an inmate in a blue polo shirt standing in the open cell door, launches himself inside when one of the group says 'come on then, go!'

He hurls himself at his opponent, the man described as the 'gypsy', who is standing topless in the cell.

But the shirtless man, who is wearing grey tracksuit bottoms, is quick to push back, forcing his attacker on to the other side of the small room.

The crowd urge the two inmates on, saying 'go on' as they pummel each other. Slapping his heard as the 'gypsy' furiously strikes the challenger, backing him towards the door.

Fighting back: The topless 'gypsy' furiously punches the challenger, left, before he stops for breath, right

A chorus of 'go on, go on' is heard from the men standing in the corridor as they encourage the inmates in their ruthless clash.

The 'gypsy' shouts 'you f****** c***' as his opponent falls into the corridor. The others try to quieten him, looking around to check if anyone heard.

The shirtless man bounces up and down in anticipation of his opponent's return, breathing heavily and saying 'come here, come here'.

Taking pleasure in the match-up, the cameraman turns the lens towards and inmate standing at his side, who says 'hello' with a big smile on his face.

Admitting defeat: The man in the blue polo shirt eventually backs off, as his opponent waits inside

Making peace: The two fighters embrace each other, left, and the victor is congratulated by other prisoners

The 'gypsy' is still ready to strike at any moment but winds down when one of the onlookers asks 'is that it?' The opponent, who is seen pacing outside, appears to have admitted defeat.

Another inmate tells the 'gypsy': 'That's it. You're done. You win'.

Two inmates walk in from the corridor to embrace the panting victor as others comment that it was a 'fair fight'.

The opponents are told to 'shake hands' and appear to embrace in the corner of the room.

One inmate says, 'that's how we sort things out in prison' as another adds, 'the thing is dealt with now'.

Cleaning up: The loser washes blood from his face, pictured, as others plan to wipe blood from the floor

The video ends with the man in the blue shirt wiping blood from his face as others talk about getting tissues and a mop, apparently to wipe blood off the floor.

A Prison Service spokesperson said: 'This behaviour is unacceptable. The incident was investigated and disciplinary proceedings have already started against the prisoners involved.