Nigeria, June 1 -- When the presidential campaign of the All Progressives Congress, APC, was formally inaugurated in January 2015, then candidate Muhammadu Buhari promised to tackle corruption and insecurity, and develop the economy.

Mr Buhari, a former military head of state, told members of the party at the Adokiye Amasiemeka Stadium in Port Harcourt, capital of Rivers State, that he would pick competent hands to run the nation's economy, which he said was in poor shape.

"The fundamental issue facing this country is insecurity and the problem of economy which was being made worse by corruption. I assure you that we are going to finally assemble a competent team of Nigerians to efficiently manage the country," he said.

"I am appealing...