FRIDAY night's boxing show at the Metrodome was abandoned as troubled flared up in the crowds.
Fighting in the crowd broke out half way through Damon Jones's fight with Simeon Lucas.
At least two people were cut on their heads and police have seized recorded footage.
Trouble was brewing from the moment that Jones, from Leeds, entered the ring. Fans of the two fighters started goading each other from the first bell - and things turned ugly in the third round as both sets of fans charged each other.
The Leeds lad's supporters, who were seated in a stand, allegedly began launching missiles at a smaller group on the floor.
Despite an end of the round plea from Damo for the trouble to stop, the riot continued and got worse.
The police were called to the scene but by the time they arrived the damage had been done.
The main event, featuring hometown fighter Matthew Mallin and Denaby’s Adam Jones, was not allowed to go ahead.