HADJI ALI, IRAQ - OCTOBER 21: An Iraqi fighter belonging to a Sunni militia headed by Sheik Nazhan, a prominent tribal leader with 700 men under his command, holds a rifle on the roof of Nazhan's home which was destroyed during a battle with ISIS fighters ahead of the Mosul offensive, on October 21, 2016 in Hadji Ali, Iraq. Several hundred Iraqi families have been made to leave their homes for Mosul by Islamic State fighters as the UN warns they could be used as human shields. ISIS have attacked Kirkuk today as Kurdish and Iraqi forces, backed by a coalition including Britain and the U.S.A continue their offensive to retake Iraq's second largest city of Mosul. (Photo by Carl Court/Getty Images)