Nigeria: A nation divided

Nigerians are trying to work out whether the double postponement of Saturday's legislative elections is part of an elaborate attempt to rig them, a brave move to block such attempts, sheer incompetence, or a mixture of all three.

Nigeria should be Africa's powerhouse - it is the continent's biggest oil producer and most populous country. But after decades of poor governance, most of its 160 million people are still mired in poverty. They are also divided along many lines - ethnic, religious, economic and political - and sometimes these tensions boil over into violence. Explore these maps to discover more.