A picture taken on February 13, 2015 shows the village Nougboua after it was attacked by Nigeria's Boko Haram rebels. Nigeria's Boko Haram rebels carried out their first attack Friday inside neighbouring Chad, targeting a village on the shores of Lake Chad as part of a widening insurgency that has sucked in four countries. AFP PHOTO / STEPHANE YAS        (Photo credit should read STEPHANE YAS/AFP/Getty Images)