LAGOS, Nigeria (Reuters) -- A Nigerian Christian leader said on Thursday the killing of hundreds of Muslims by Christian militia in the town of Yelwa on Sunday was the product of "a state of war" between the two faiths in Africa's most populous nation. The conflict between the Christian Tarok and the Muslim Fulani is patently about their competing claims over the fertile farmlands of Plateau state in central Nigeria, but religious leaders and academics said it fed an already strong trend of religious hatred in the impoverished oil exporting country. "What we have is a state of war," said...