Rival candidates in the Nigerian presidental election, President Goodluck Jonathan (left) and Muhammadu Buhari exchange a signed peace deal in Abuja on Thursday. About 800 people died in post-election violence in 2011 in which Mr Jonathan defeated Mr Buhari. Photograph: EPA/STR

Nigeria’s president Goodluck Jonathan warned against violence ahead of Saturday’s presidential election as people stockpiled food, cash and fuel for f(...)

Nigerian military on patrol in an area reclaimed from Boko Haram. Officials say the Islamist group kidnapped hundreds of civilians while retreating from Damasak in the northeast of Nigeria. Photograph: EPA/STR

Hundreds of civilians, including many children, have been kidnapped by Boko Haram extremists who are using them as human shields in Nigeria, officials(...)

A girl stands in front of soldiers from Niger and Chad in the recently retaken town of Damasak in Nigeria. Soldiers  who liberated the  town  from Boko Haram militants have discovered the bodies of at least 70 people. Photograph: Emmanuel Braun/Reuters

Boko Haram militants have kidnapped more than 400 women and children from the northern Nigerian town of Damasak which was freed this month by troops f(...)

A Nigerian soldier covers his face at a mass grave in the recently retaken town of Damasak, Nigeria, March 20th, 2015. Photograph: Reuters/Emmanuel Braun

Soldiers from Niger and Chad who liberated the Nigerian town of Damasak from Boko Haram militants have discovered the bodies of at least 70 people (...)

Nigerien soldiers hold up a Boko Haram flag that they seized in the recently retaken town of Damasak. Photograph: Emmanuel Braun /Reuters

Soldiers from Niger and Chad who liberated the Nigerian town of Damasak from Boko Haram militants have discovered the bodies of at least 70 people,(...)

Residents stand near a smouldering remains of a bus targeted in a suicide attack in the northeast Nigerian town of Potiskum, on February 24th, 2015. Photograph: AMINU ABUBAKAR/AFP/Getty Images

Suicide bombers struck two bus stations in different parts of northern Nigeria on Tuesday, killing at least 26 people in attacks president Goodluck Jo(...)

A young girl with explosives strapped to her killed five people and wounded dozens at a security checkpoint outside a market in the northeast Nigerian(...)

A group of Nigerian vigilantes, which comprises traditional hunters, patrol in North East Nigeria to assist the Nigerian military in fighting against Boko Haram Islamic militants. Photograph: EPA/STR

Boko Haram militants attacked an island on Niger’s side of Lake Chad but the army repelled them after heavy fighting, residents and security sources s(...)

A  woman carrying goods in the Cameroonian border town of Fotokol. Nigerian Boko Haram fighters went on the rampage in the border town of Fotokol on February 4th, massacring dozens of civilians. Photograph: Getty Images

Boko Haram militants fleeing a Nigerian army offensive killed 21 people on Friday in attacks near the northern village of Chibok, close to where the r(...)

A Boko Haram anti-aircraft gun seized by the Nigerian military at Monguno. A Nigerian border village has been bombed with at least 30 civilians dead, following a week of gains against the Islamist group by the  military forces.    Photograph:  Nigerian military handouts/AFP/Getty Images

An estimated 30 civilians were killed when an unidentified airplane dropped a bomb on a Nigerian border village, military sources based nearby in Nige(...)