One of Africa’s last surviving liberation leaders dies in hospital while being treated for pneumonia

Atiku Abubakar denounces Saturday’s election as ‘sham’ and vows to challenge result

Initial results give incumbent Muhammadu Buhari a lead over his main challenger

Delayed presidential election marred by violence projected to be tight

Incumbent expected to dominate presidential poll disrupted by technological failures

Unspecified ‘challenges’ led to postponement of vote last week five hours before polling time

Petrol price cut to encourage voters to travel after last-minute postponement a week ago

Logistical and operational concerns necessitated delay, electoral commission says

Past votes in Africa’s largest democracy marred by violence, intimidation and rigging

Nigeria will end up with another uninspiring head of state at a moment when it badly needs courageous leadership and some fresh thinking

Buhari is in last throes of bruising re-election campaign

President promises to defeat Boko Haram insurgents and end corruption