We all know that Nigeria has a large Muslim community, mainly in the north and that in several states Sharia law has been introduced. Clashes have in the past occurred between Christians and Muslims, often ended by national (federal) action.

These two short articles illustrate: http://news.bbc.co.uk/1/hi/world/africa/8169359.stm and http://www.telegraph.co.uk/news/worl...tion-raid.html

(From the later) Around 70 fighters from the fundamentalist group armed with guns and grenades attacked a police station in Nigeria's northern Bauchi state early on Sunday, but retreated after officers opened fire.