28.11.2015 - A Kurdish security police officer stands next to the entrance of a tunnel dug by ISIS militants inside a house in the city of Sinjar, Nineveh province, northern Iraq. Between 30 and 40 tunnels, used by ISIS to hide from air strikes and store weapons and explosives, have been discovered inside the city. Sinjar was liberated from ISIS control on November 13, following coalition airstrikes and a ground-force offensive by Kurdish forces made up of Yazidi, Peshmerga and PKK soldiers. All infrastructure has been destroyed and few of its former inhabitants have returned.