A four hundred-person mass brawl broke out Friday night at a casino in Queens.

Patrons at a bar opening inside the Resorts World Casino, next to JFK airport, reportedly turned on one another around 10pm.

Video of the fight sees a crowd of people erupting from a bar area, punching, kicking, shouting and re-purposing casino decorations as weapons.

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Chairs in the air: An enormous fight broke out at a bar opening at Resorts World casino in Queens, New York

Bar brawl: Video posted on twitter showed angry patrons attacking one another

Fists flying: Huge crowds of people went at one another using their fists, or even casino props, to hurt one another

According to the New York Daily News, the fight shown in the brief video clip snowballed until some four hundred people were fighting. It is not clear why the fight started.

The carnage spilled out into the parking lots, where police and security guards tried to calm things down.

Ambulances could be seen outside tending to the wounded, which included guards and officers.

Police told the News that four people were arrested, and will be charged in due course.

NYPD sources suggested that the violence was gang-related.