Street Fight

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Fightclub Star in Street Brawl

TMZ has learned the Austin Police Department has viewed the tape of the bloody street brawl involving ex-UFC star Roger Huerta ... and have opened an investigation into the incident.

We're told cops are interested in interviewing everybody who was present during the Saturday morning brawl -- including Huerta and the man he knocked out.

Law enforcement sources tell us so far cops have not identified the man Huerta knocked out -- or the woman who THAT guy attacked ... but officials are working on it.