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The liberation of Mosul from Islamic State came at a high cost, according to an AP probe which found that between 9,000 and 11,000 civilians died during the process. The coalition acknowledges responsibility for 326 of the deaths, RT reported.

The investigation cross-referenced independent databases from non-government organizations and analyzed the city morgue's list of 9,606 names of people killed in the battle. The probe found that at least 3,200 civilians were killed by Iraqi or US-led coalition airstrikes, artillery fire, or mortar rounds between October 2016 and July 2017.

Most of those victims were described in Health Ministry reports as simply being "crushed." However, the US coalition has acknowledged responsibility for just 326 of those deaths, while stating that it lacks the resources to send investigators to Mosul, according to AP.

Another one-third of the dead were killed in the final violent campaign of Islamic State (IS, formerly ISIS). The causes of the remaining deaths could not be determined, as they were civilians who were trapped inside neighborhoods hit by airstrikes, IS explosives, and mortar rounds from all sides of the fight.

The numbers are likely a low estimation of the actual situation, as hundreds of dead civilians are thought to still be trapped underneath rubble in the city, which saw some of its 44 neighborhoods almost completely destroyed. Thousands are believed to be in mass graves in and around the city, and as many as 4,000 in the natural crevasse known as Khasfa. The AP toll does not include those figures.

The databases used by AP in its investigation are from Amnesty International, Iraq Body Count, and Airwars. It also utilized a UN report in its research.