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Two rivers, the Tigris and the Euphrates, are the lifeblood of Iraq. Iraqis depend on these waters for fishing, farming, drinking and hydro-electric power. Now there are fears that Islamic State militants could take control of the country by capturing dams on these waterways allowing them to flood upstream regions and create drought in cities downstream. ÃÛÑ¿´«Ã½ Persian's Jiyar Gol has been to the region to investigate. He tells David how a life-giving natural resource can become a deadly weapon.