MASS graves full of the bones of at least 400 people have been found at an Iraqi military base, authorities have said.

Those buried are thought to be victims of Isis after the jihadists turned the province of Kirkuk into "an execution ground".

8 Authorities made the grisly find of more than 400 bodies in mass graves Credit: AFP or licensors

The horrific find was made about two miles from Hawija in northern Iraq.

Kirkuk governer Rakan Saeed said some of the hundreds of people were wearing prison uniforms, while others were in civilian dress.

He said: "We are standing here, where... at least 400 civilians were dragged, some in their red jumpsuits, and brutally executed by Isis."

People who witnessed the deaths reportedly led authorities to the graves.

8 Startling footage shows how big the mass graves are Credit: Sky

8 The mass graves even had parts of cars thrown into the deep holes Credit: Sky

8 Clothes on some of the victims bodies showed they were civilians Credit: AFP or licensors

8 It is thought they were victims of Isis executions before they were buried together Credit: AFP or licensors

The Commission of Human Rights and the Iraqi government have been asked to help identify those killed.

Khalaf Luhaibi, a local shepherd who led troops to the site, said Isis used to bring captives to the area and shoot them dead or pour oil over them and light them on fire.

The area was strewn with torn clothing and what appeared to be human bones and skulls.

Iraqi forces have now driven Isis from nearly all the territory it once controlled, and authorities have already uncovered several mass graves in other newly liberated areas.

8 The deep graves contained more than 400 victims Credit: Sky

8 Authorities said that local people were able to lead them to the graves as they had witnessed the executions Credit: AFP or licensors

8 All bodies will be attempted to be identified, authorities have said Credit: AFP or licensors

U.S.-backed Iraqi forces have driven the extremists from nearly all the territory they once controlled, with some fighting still underway near the western border with Syria.

On Saturday, Iraq's Prime Minister announced an operation to capture a patch of territory on the western edge of the country near the border with Syria.

Hours later, Iraqi Defence Ministry announced capturing Romana area, saying the troops will head to nearby town of Rawa.

According to Ahmed al-Asadi, a spokesman for the Shiite-majority paramilitary forces, Rawa is the last Iraqi town held by IS who still control some scattered small villages in mainly desert areas.

In September we reported how the last stronghold of ISIS in Northern Iraq fell – with coalition forces declaring the jihadis faced “death or surrender”.

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