Africa’s richest man, Nigeria’s Aliko Dangote, has risen up the annual Forbes list of world billionaires, with his fortune increasing to $15.4bn (£11bn).

Mr Dankoto is ranked 51, compared with 67 in the 2015 list when the magazine put his fortune at $14.7bn.

He is the founder and chairman of Dangote Cement, Africa’s continent’s largest cement producer.

The second-richest African is another Nigerian Mike Adenua, who is worth $10bn, Forbes says.

The magazine puts Mr Adenua, who built his fortune in the oil and telecom industries, at 103 in list of of world billionaires.

South Africa’s diamond mining magnate Nicky Oppenheimer is the third-richest African. He is worth $6.6bn, and the 174th richest person in the world, Forbes say.