NORTH CHARLESTON, S.C. — The fatal shooting of a black man running from a white police officer inflamed the nation's debate over police use of force Wednesday, and the mayor and police chief of South Carolina's third-largest city said they were "sickened" by what a bystander's video revealed. The officer, who has been charged with murder, was fired, and the mayor said he ordered enough body cameras for every officer on the street. But that did little to quell the outrage of an angry crowd at North Charleston's City Hall, and the officials were shouted down by protesters calling for justice.