At least two people were killed and seven others were injured, including two police officers, in shootings across Chicago during the Independence Day holiday weekend. Among those injured were two Chicago police officers who were shot by a man during a traffic stop around 5 p.m. Friday in South Shore, according to police Supt. Larry Snelling. The officers, identified by Chicago Sun-Times sources as Carl Williams, 27, and Esteban Cervantes, 30, were described as having non-life-threatening injuri