A woman walks in a sand storm near Lake Chad, in Chad, Tuesday March 3, 2015. Chadian troops have seized a strategically located northeast Nigerian town from Boko Haram, but not before the defeated Islamic extremists killed hundreds of civilians, Chad's military said. The Chadian forces regained control Monday of Dikwa, a town occupied by the militants for weeks, said Chad's military spokesman Col. Azem Bermandoua.(AP Photo / Jerome Delay), APTOPIX