Iraq's Shiite-led government, trying to reverse the marginalisation of Sunnis, is seeking to form a "bridging entity" where Sunnis tribesmen defend their provinces before they are brought into an Iraqi national force, the State Department official told reporters on condition of anonymity.
The official disclosed the information as US Secretary of State John Kerry prepared Wednesday to host talks in Brussels with foreign ministers from scores of countries which are trying to help defeat the Islamic State in Iraq and Syria.
Prime Minister Haider al-Abadi, a Shiite whose more inclusive government was formed in September, "is committed ultimately to bringing the Sunnis into the mainstream," the official said.
IS proclaimed a caliphate in Syria and Iraq in June after making dramatic advances across a swathe of Iraq, partly as a result of appealing to a marginalised Sunni population.
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The members of Iraq's government "are working to empower Sunni fighters. They are already graduating Sunni fighters out in Al Asad in the Anbar province," the official said.
He confirmed the US forces, along with their Iraqi counterparts, were training the Sunnis from tribes in Anbar province, while the Iraqi troops were providing them with equipment.
The government is also aiming to form Shiite national guards in Shiite areas as well as mixed forces in areas where both sects live, he added.
Ahead of building up a national force that defends Iraq's territory, "it recognises there needs to be a middle tier that can respond to terrorism and criminality at the provincial level," he said.
The official said foreign ministers from European, Arab and other states that are part of the 60-member coalition against IS will discuss strategy Wednesday at their first ministerial meeting.
Besides discussing the military aspect, they will discuss how to stem the flow of thousands of foreign fighters, delegitimise the IS "brand," disrupt IS finances, and provide humanitarian aid to people affected by the violence, the official said.