Mohamud Saleh, shown here during a recent interview, built his reputation by greatly reducing crime in a lawless part of northeastern Kenya in the 1990s. After an absence of more than a decade, he's returned to battle terrorism, and argues that the same tactics will work this time as well. Gregory Warner/NPR hide caption

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The rapper V-Sita (at right) had a No. 1 hit in Kenya with the song "Hivo Ndio Kunaendaga." YouTube hide caption

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A child is vaccinated in Makadara Health Clinic, Nairobi, Kenya. Greg Warner/NPR hide caption

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Workers finish installing a billboard showing Kenya's President Uhuru Kenyatta and President Barack Obama in downtown Nairobi a day before Obama's visit. Ben Curtis/AP hide caption

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Kenyan graffiti artist Bankslave created a mural of Barack Obama. The president himself will visit Kenya on Friday. One of the president's agenda items is to promote solar power. Ben Curtis/AP hide caption

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Burundi's President Pierre Nkurunziza walks with military officials during the country's Independence Day on Wednesday. Despite criticism at home and abroad, the president is defying a two-term limit and running for a third term in an election set for the middle of July. Berthier Mugiraneza/AP hide caption

itoggle caption Berthier Mugiraneza/AP