Saleh Mamman, a former Nigerian power minister, has been sentenced to 75 years in prison for laundering 33.8bn naira ($24.7m; £18.5m), a rare conviction against corrupt officials in the West ​African nation. Last week, Mamman was found guilty of 12 counts, including using private firms to funnel money linked to government-funded power plants. The 68-year-old was sentenced in absentia on Wednesday - according to the Economic and Financial Crimes Commission (EFCC), Mamman has been "out of