One hour to go before Nigerians start to vote in the presidential election. President Goodluck Jonathan has called for calm in the face of rising tensions and fears of violence.
Africa's most populous nation goes to the polls with the election being seen as the closest in its history. Jonathan is facing a strong challenge from the main opposition's Muhammadu Buhari.
Some 1,000 people were killed in clashes after the last election in 2011 when Jonathan defeated Buhari, and there are fears of a repeat this time round.
Nigerians have in recent days being queueing for fuel and buying water and groceries as a precaution in the event of election-linked violence.