This is the moment a student party descended into chaos in Fallowfield after gatecrashers stormed in and began fighting.
Footage shows revellers shouting, screaming and laughing as a teenager is punched by two people in the crammed house, full of around 90 people, on Ladybarn Crescent.
One teen excitedly yells 'that's what I'm talking about' as he walks away after punching the victim during the mayhem, while another starts dancing.
Another shouts 'don't touch my boy man' in a distressed state after the attack.
The Manchester Evening News was sent the footage, which has been seen by police, after publishing an appeal online.
Trouble flared when a 'number of' uninvited guests arrived at the party on October 22 and began causing a disturbance.
A bin was thrown through a window, before a fire extinguisher was set off.
Police said a teenage boy was the victim of a "vicious unprovoked" attack when he tried to evict the gatecrashers from the house.
A post on the GMP Fallowfield Facebook page on Saturday (November 2) said: "The victim stepped forward showing courage and asked these individuals to cease their disruptive behaviour, and for his troubles was set upon by a number of youths.
Read more of today's top stories here
"We know that there was approximately ninety people in attendance at this party."
A GMP spokeswoman confirmed that no arrests had been made on Monday (November 4).
Get breaking news first on the free Manchester Evening News app - download it here for your Apple or Android device. You can also get a round-up of the biggest stories sent direct to your inbox every day with the MEN email newsletter - subscribe here. And you can follow us on Facebook here.
