NDAME, Senegal — Seven nights a week, 13-year-old Cheikhou and his younger brother Bamba would make their way to a wooden shack they shared with dozens of other barefoot child beggars, blanketing the floor with their tired bodies.

Then one night a knocked-over candle turned their home into an inferno. Cheikhou awoke to the sounds of people screaming. He joined some 50 boys fleeing for the door as neighbors filled plastic buckets, struggling in vain to put out the fire.