This fight between a group of BJJ competitors happened last weekend in Fortaleza, Brazil at the Pan American Jiu-Jitsu of Confederates Brazilian professional fights.
According to Diaro do Nordeste an argument started between two rival Ju-Jitsu teams inside the competition and they went outside to battle it out.
The scene was recorded in video. The two fighters involved in the fight are black belts in jiu-jitsu Thiago Maia (Nova Uniao) and Thyago Frota (SAS). The athletes presented different versions as to how the fight erupted, but both said that they were sorry.
They used a mix of Jiu-Jitsu techniques and good old street fighting techniques. You can some members of Gracie Barra in the crowd surrounding the fight.

Thyago Frota
Frota was the champion in his category.
The police had to intervene to separate them and restore order.

Thiago Maia
Check out the video:
https://www.youtube.com/watch?v=Nd-IhW-jvUo