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This is the shocking moment two men launched into a full-scale punch-up in the middle of Sainsbury's - leaving a security guard appearing helpless.
The video footage of the incident was uploaded onto YouTube by a user claiming to be 'Traveller and gypsy videos gypsy' - but it's not clear what the argument was about.
The incident occurred at the supermarket 's Superstore in Hayes, West London, last night - and MirrorOnline has decided not to name the people identified online in the fight.
The footage begins with a man running with his mobile phone in his hand to the front of the store and in through the doors where the fight is clearly well underway.
The two men look like they are in the boxing ring as they swing punches at each other to the consternation of staff screaming at them to stop.
Punches are rapidly and violently exchanged before the man behind the camera appears to encourage one of the men to continue.