The armies of Chad and Niger launched a joint offensive against the Nigeria-based Islamist group Boko Haram. Military sources said Chadian and Nigerian forces began the offensive Sunday morning in Nigeria's northeastern Borno state.
Chad, Niger Launch Joint Offensive Against Boko Haram

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Chadian troops and Nigerian special forces observe as a U.S. special forces soldier (right) conducts a hostage rescue exercise in the Flintlock exercise in Mao, Chad, March 7, 2015.

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Nigerian special forces guard a compound in a hostage rescue exercise at the end of the Flintlock exercise in Mao, Chad, March 7, 2015.