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Kurdish forces say they are making progress in a major offensive against fighters from the so-called Islamic State who captured the town of Sinjar in northern Iraq last year. The Kurds say they have cut off Sinjar on three fronts and are massing for a final push to re-take the town. Christine van den Toorn, who works for the American University in Iraq, explains the strategic importance of the town. (Photo: The aftermath of an air strike on Sinjar in Iraq. Credit: Reuters)