Tens of thousands of Muslims are fleeing to neighboring countries by plane and truck as Christian militias stage brutal attacks, shattering the social fabric of a war-ravaged nation. In towns and villages as well as in Bangui, Christian vigilantes wielding machetes have killed scores of Muslims, who are a minority here, and burned and looted their houses and mosques in recent days, according to witnesses, aid agencies and peacekeepers. The cycle of chaos is fast becoming one of the worst outbreaks of violence along Muslim-Christian fault lines in recent memory in sub-Saharan Africa...