The United States suffered another deadly weekend of gun violence, with at least nine mass shootings involving four or more victims. In Tennessee, two people were killed and 12 others wounded by gunfire outside a Chattanooga nightclub early Sunday morning. It was the city’s second mass shooting in as many weekends. In Philadelphia, three people were killed and 11 others wounded by gunfire Saturday night when multiple gunmen opened fire on a large crowd. So far no arrests have been made. Two handguns were retrieved at the crime scene, including one with an extended magazine.