They apparently tried to settle their differences with a crowd in their midst. As hundreds gathered at Bunny Friend Park in the Upper Ninth Ward yesterday for an impromptu music video filming, two groups in the crowd opened fire against one another, injuring 16. Police were already en route to break up the gathering, so they were on the scene almost immediately. Ambulances quickly ferried victims to hospitals, where all are listed in stable condition. Police are now searching for suspects, with witnesses saying at least two men fired into the crowd.