Helmeted Chadian and other African police commandos, armed with dummy rifles hunt down terrorist suspects who've taken hostages in the building, during a US military led Flintlock 2017 law enforcement exercise in Ndjamena Chad, 15 March 2017. Ofeibea Quist-Arcton/NPR hide caption

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Sally Deng for NPR

Dogs Block President Carter's Dream Of Wiping Out Guinea Worm

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An armored vehicle used by Boko Haram militants captured by the Nigerian military in Maiduguri, Borno state, late last month. The extremist group appears to be expanding its operations into neighboring countries in an effort to establish an independent Islamic state. EPA/Landov hide caption

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Photos of Luanda, Angola, tell a tale of two cities: sprawling poor neighborhoods and a glitzy waterfront. Saul Loeb/Getty Images; Michael Gottschalk/Getty Images hide caption

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Saul Loeb/Getty Images; Michael Gottschalk/Getty Images