Herdsmen and others cross a tributary of Lake Chad to the village of N'Gouboua, Chad, Thursday, March 5, 2015, using the same route the Nigerian refugees used to flee Boko Haram. Boko Haram militants arrived in N’gouboua before dawn on Feb. 13, marking the first attack of its kind on Chad. By the time the scorched-earth attack ended, they had burned scores of mud-brick houses by torching them with gasoline and had killed at least eight civilians and two security officers. Some 3,400 Nigerian refugees had been living in the village at the time of the attack, and all have since been relocated further inland. (AP Photo/Jerome Delay)

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