An explosion during preparations for tonight's fireworks display at Uni-Trade stadium caused confusion this afternoon. This is what witnesses saw this afternoon as emergency crews responded to the situation. Someone who was inside the stadium at the time of the explosion shot this video, they posted the video to Youtube. We’re told the fireworks display is what went up as it was being prepared for tonight. Three professional pyrotechnicians were working on that display sending one of them to the hospital. Orlando Garza was at the scene of the accident with more on this story.