Those elections were considered fairly credible but with more at stake this time, will politicians be able to resist the "mago-mago", or vote rigging, of elections past, asks the BBC's Caroline Duffield in Lagos.

BBC: Nigeria's president faces free vote challenge

"They try to escape us but if they can't, they try to dump the drugs because they know this activity is very heavily penalised here, " explains Lt-Col Mago Llanez Fernandez, who heads the team responsible for intercepting the smugglers at sea.

BBC: Cuba and US find common ground in war on drugs