WARNING GRAPHIC CONTENT . The gruesome scene believed to be from the northern-Iraqi city of Hawija . 20,000 man pictured next to the bodies appears to be notorious ISIS fighter . Abu al-Rahman has been seen alongside the heads of decapitated Syrians . Caged Syrian soldiers were mercilessly paraded through that same city . ISIS are preparing to move headquarters there from stronghold in Mosul . US is currently training Iraqi soldiers to retake Iraq 's second largest city .
WARNING GRAPHIC CONTENT . The gruesome scene believed to be from the northern-Iraqi city of Hawija . One man pictured next to the bodies appears to be notorious ISIS fighter . Abu al-Rahman has been seen alongside the heads of decapitated Syrians . Caged Syrian soldiers were mercilessly paraded through that same city . ISIS are preparing to move headquarters there from stronghold in Mosul . US is currently training Iraqi soldiers to retake Iraq 's second largest city .