Nigerian President takes early lead amid vote-rigging claims

Nigeria's incumbent President Muhammadu Buhari has surged to an early lead in election returns, winning six of 36 states in Africa's largest democracy, while the main opposition rejected the count, alleging manipulation.

Election observers said the last-minute postponement of the vote until Saturday discouraged some Nigerians from going to the polls as Mr Buhari seeks a second term at the head of a country troubled by corruption, insecurity and a weak economy.