Detectives seek phone footage of "ugly scenes" at Leeds boxing event
Around 40 people were involved in the fighting which broke out during an event hosted in the Centenary Pavilion at Leeds United's stadium on Saturday night.
Footage which emerged online showed people in the crowd throwing punches and chairs.
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Hide AdDetective Inspector Dave McDougal, of Leeds District CID, said: "These were really ugly scenes that put people in fear and ruined this event for the majority that were there to enjoy a night out.
"The behaviour that was witnessed was completely unacceptable and we are continuing to carry out a thorough and comprehensive investigation to identify all those that were involved."