Liberating Mosul from "Islamic State" What has happened in Mosul since the operation to retake the city from the so-called "Islamic State" started in October? Photo essay by Nadine Berghausen Iraqi army discovers a mass grave: while Iraqi troops advanced further into territory held by the so called “Islamic State” in their campaign to recapture Mosul, they found a mass grave which holds about 100 bodies, many of them decapitated. AP footage shows bones and decomposed bodies dug out of the ground by a bulldozer. This Iraqi federal police officer holds a stuffed animal he found on the site Evidence of brutality: the grave, found near the town of Hammam al-Alil near Mosul, proves to be a dark testimony to the Islamic State′s brutality. IS militants have carried out a series of massacres since seizing large areas of southern and central Iraq in 2014. This photo shows a member of the Iraqi security forces inspecting a building that was used as a prison by Islamic State militants in Hammam al-Alil Freed from terror: these displaced Iraqi men from the Hammam al-Alil area celebrate their liberation as they return to their homes after the recapture of their village from Islamic State by Iraqi forces Oil fields on fire: oil wells have been set ablaze by IS in an apparent response to the ongoing military offensive to drive the extremist group out of its stronghold. A military commander said more than 5,000 civilians have been evacuated from eastern parts of Mosul and taken to camps. The surprise attack showed that even while under siege, the group could still sow chaos in parts of Iraq far from its base in Mosul What is the fight for Mosul all about? Smoke rises during clashes between peshmerga forces and IS militants in the town of Bashiqa, east of Mosul. Initially used by IS to establish their caliphate and henceforth the key source of prestige and resources, Mosul is also the base for IS′ chemical weapons operation. The ancient Assyrian city has also been a vital source of tax revenue and forced labour The role of the Iraqi army and its allies: Iraqi special forces take cover as their unit comes under fire from an Islamic State sniper. Together with Kurdish peshmerga and Shia militias, Iraqi forces intensified fighting and moved into more densely populated areas of the city without air support from the US-led coalition due to the high risk of civilian casualties Kurdish peshmerga: meanwhile, Kurdish peshmerga forces decided to focus on other strongholds of resistance in northern Iraq and on the Kurdish-controlled city of Kirkuk, where IS initiated a campaign of violence in response to the advances of the Iraqi army towards Mosul Fleeing from the fighting: the United Nations says over 34,000 people have been displaced from Mosul since the operation began on 17 October, with about three quarters settled in camps and the rest in host communities