REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE CONTENT OF THIS VIDEO, WHICH HAS BEEN OBTAINED FROM A SOCIAL MEDIA WEBSITE / PLEASE NOTE THE EDITING STYLE IS FROM SOURCE, NOT REUTERS<br /> <br />With their guns held high - Islamic State fighters begin to take prominent landmarks in Iraq - including the Mosul dam.<br /> <br />In this amateur video Reuters cannot independently verify, the Islamic State flag flies above the dam as flatbed trucks patrol areas.<br /> <br />Controlling the dam would mean a major gain for the militant fighters as it would allow them to open the floodgates, threatening cities and civilians.<br /> <br />It also would allow them to cut of a vital source of water and control the electricity.<br /> <br />They've also raised their flags above government buildings, and took control of a nearby hospital.<br /> <br />ISLAMIC STATE FIGHTERS BESIDE TANK, FIGHTER SAYING (Arabic): "Our message to the whole world: we are soldiers of the caliphate and we are coming, God willing."<br /> <br />An engineer at the Mosul
