Also today, the secretary general of the Arab league visited Baghdad to encourage political dialogue with Irbil as Iraq's Kurdish region pushes forward with plans to hold a referendum on independence September 25.
Despite ongoing military operations to clear out the last pockets of territory held by IS, the looming referendum has increased tensions between the central government and the Kurdish region.
"There are large operations underway ahead of the liberation of Hawija and surrounding areas," Iraqi Defense Minister Erfan al-Hayali said, explaining that his forces were working closely with Iraqi Kurdish forces known as the Peshmerga as well as the coalition.
It is unclear if Iraqi security forces and the Peshmerga will continue to cooperate once the referendum is held.
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Last month, the Iraqi military command overseeing the IS fight declared victory in Tal Afar, west of Mosul and announced Hawija, 240 kilometers north of Baghdad, would be the next battle against the extremists.
The stepped-up coalition strikes are targeting IS territory in western Anbar as well as Hawija, said US Army Colonel Ryan Dillon, coalition spokesman.
Defense Minister al-Hayali said his forces began radio broadcasts and leaflet drops on Hawija warning civilians of the planned push.
The United Nations said the operation to retake Tal Afar forced some 20,000 people to flee, according to counts by Iraqi authorities.
When the fight for Hawija begins, the UN estimates some 60,000 people will be impacted.