Lake Dallas (WBAP/KLIF) – Something went seriously wrong Thursday night during the finale of the Lake Cities 4th of July Fireworks Show on the north side of Lewisville Lake. At 9:35 PM a large explosion ripped through the trailer and equipment owned by the pyrotechnics company that was putting on the show. They were severely damaged, and several of the technicians were injured, although none seriously. No spectator was hurt, but the show was immediately stopped, and the crowd was directed to leave the area. the cause of the accident is under investigation.