BOUAKE, Nov 8 (Reuters) - Soldiers in Ivory Coast's northern rebel-held zone fired warning shots on Thursday to disperse demonstrators who attacked them with stones during a protest over electricity bills, a Reuters witness said. Several hundred protesters blocked roads, burned tyres and smashed up one of the offices of the national power company in Bouake, the rebel headquarters and Ivory Coast's second city. (Reporting by Charles Bamba; Writing by Peter Murphy; Editing by Alistair Thomson)
