(CNN) — The militant group that has been ruthlessly fighting to take control of Iraq has apparently posted chilling photos on jihadi Internet forums seeming to show the executions of Iraqi security forces.
CNN cannot independently confirm the authenticity of the images purportedly posted by ISIS, or the Islamic State in Iraq and Syria. CNN is examining the terrain in the images, some of the signage on buildings in several of the pictures and the uniforms of the apparent victims. Those details suggest the photos are real and were taken in Iraq.
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A caption on some of the images: "apostates heading to their hole of doom."
ISIS, an al Qaeda splinter group, wants to establish a caliphate, or Islamic state, in the region that would stretch from Iraq into northern Syria. The group has had substantial success in Syria battling Syrian President Bashar al-Assad's security forces.