Embedded Player Africa's most populous country Nigeria has long been plagued with violent internal battles between its Muslim north and Christian south. On Sunday, in the central city of Jos, hundreds of Christians, including women and children, were killed by Muslim herders in retaliation for an earlier attack in January. But is religion alone the sole division between the two groups of Nigerians? Host Michel Martin talks with Eliza Griswold, Schwartz Fellow at the New America Foundation and author of the upcoming book The Tenth Parallel: Dispatches from the Fault Line Between Christianity and Islam" about the roots of the conflict and the intersection of the two faiths.