Iraqi forces search the site of a suspected mass grave containing the remains of victims of the Islamic State group, near the former al bakara military base on November 11, 2017, south west of Hawija. PHOTO: AFP
The string of grisly discoveries was made at a military base around three kilometres (two miles) from the city that the militants "turned into an execution ground", Kirkuk governor Rakan Said said.
"Not less than 400 people were executed," he said, adding that some were clad in the uniform of prisoners condemned to death while others wore civilian clothing.
IS was forced out of Hawija -- 240 kilometres north of Baghdad -- by Iraqi forces in October in a sweeping offensive that has seen the group lose the vast bulk of territory it seized in 2014.
As government troops have advanced across Iraq they have uncovered dozens of mass graves holding hundreds of bodies in areas that fell under their brutal rule.
Once promised paradise, Islamic State fighters end up in mass graves
The burial pits near Hawija were discovered "thanks to witness accounts from local residents" given to the Iraqi military, General Mortada al Luwaibi said.
Saad Abbas, a farmer from the area, told AFP that during the three years of IS control the group's fighters could be seen "driving around in cars with their prisoners".
"They would shoot them and then throw them to the ground or burn their bodies," Abbas said.
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