Africa News Tonight: UN Troops Killed in Mali & Jill Biden Arrives in Namibia

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The U.N. peacekeeping mission in Mali (MINUSMA) says a roadside bomb has killed three peacekeepers and seriously injured five others; U.S. first lady Jill Biden has arrived in Namibia on the first stop of a five-day Africa tour; And, this Saturday the focus of the world will be on Nigeria which holds general elections for president, vice president and national legislators.