Nigeria's President, Muhammadu Buhari, says he has ordered the police and military to be ruthless with vote riggers, following the last-minute postponement of the general election.

The incumbent president also called the electoral commission incompetent and ordered an investigation into why the vote was delayed.

Election officials cited logistical reasons for the postponement.

Buhari made the comments at an emergency meeting of his All Progressives Congress party in the capital, Abuja on Monday.

Channel Africa's correspondent in Lagos, Collins Nosa. Atohengbe reports…