The radio was saying that it started with one guy butting another with his chest and it was starting to escalate. Another person, thinking it was getting out of hand, fired his handgun into the air to stop it (so the story goes). Once the first shot was fired, the other armed proponents started firing, too. The cops reported finding at least 25 shell casings, and they're fairly certain that there are more in the vegetation. When the entrance/exit was blocked (by nearby law enforcement, it sounds), many weapons were tossed into the bushes; others were found in cars.
Sue