(Radio Iowa) – Seven people have now been arrested in connection to a large fight at an event center in Storm Lake on December 24th that left one man unconscious. On Sunday, Storm Lake Police arrested 22-year-old Isaiah Rivera of Cherokee after he surrendered himself to authorities. Rivera allegedly displayed a handgun during the incident and pointed it at other people inside the event center. Rivera left before police arrived that night.

Rivera has been charged with Participating in a Riot, Going Armed With Intent, and Assault While Participating in a Felony.In late December, 30-year-old Yusnavy Cruz of Storm Lake and 31-year-old Yoandri Barista Valdes of Lakeside were each arrested on a charge of Participating in a Riot. The alleged fight happened on the dance floor of the Oasis Event Center. A man was hit in the head with a chair and found unconscious.

Storm Lake Police are still trying to identify one other male suspect who was allegedly involved in the brawl.