Ten years after the fall of its caliphate in the Middle East, the Islamic State has quietly rebuilt its forces in an arid and rugged region of northern Somalia. Through a masterful investigation, the Washington Post has shed light on the scale of this struggle in the remote provinces of one of the world's poorest countries. Carolyn Van Houten, a photojournalist for the American daily newspaper, was able to follow Somali soldiers and document their hunt for Islamic fighters in caves recently discovered in Puntland.