Yup, it's all about oil.

In the north, anti-Christian violence continues. The most recent outbreak came about when paranoid Moslem high school students accused Christian students of planning an attack on a mosque. This led to attacks on the Christian minority in the northern Kano state (which is mostly Moslem), the death of nine Christians, the wounding of 61 others. Some 500 Christians were forced to flee their homes, and nine churches were burned down. Islamic radical preachers in the north are constantly preaching against the Christian "war on Islam," even though nearly all the religious violence in the world is Moslems attacking non-Moslems.