"Iraq's security forces, backed by coalition military airpower and advice and assistance of coalition militaries from around the world, has been effective in driving ISIL out of territory that they previously controlled," White House Press Secretary Josh Earnest told reporters.
"We know that ISIS has been driven out of about 40 per cent of the populated areas that ISIS previously controlled in Iraq. That's tangible progress," he said.
Earnest's remarks came hours after capital Baghdad was rocked by one of the deadliest ISIS bombings targeting markets and a restaurant in Shiite-dominated neighborhoods, killing at least 69 people.
"We know that in places like Ramadi. ISIS didn't just occupy that community - they essentially destroyed it. And rebuilding that infrastructure and rebuilding those communities so that people feel confident in moving back home is going to be critical to our longer-term success of bringing some stability to that region of the world," he said.
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"The important financial contributions that have been made by countries around the world are also an important part of our strategy, but they're all predicated on the Iraqi people and the international community having confidence in the effectiveness of the Iraqi central government," Earnest added.
"They are focused on missions that involve protecting the embassy, carrying out military air operations against ISIS targets, in some cases providing training and advice and assistance to Iraqi security forces, and there's a small number of special operators that have been organised into these expeditionary forces that can carry out raids against senior ISIS figures," Earnest said.
"We've been very clear about the mission that US forces in Iraq are pursuing," he said, adding that the US strongly condemns the yesterday's ISIS bombings.
"We extend our deepest condolences to the victims and their families. These string of attacks by ISIS is latest reminder of the danger that this group poses to all Iraqis and the importance of Iraqi leaders from all communities, working together against a common enemy," he said.
"We believe that will have a corresponding impact on the effectiveness and resilience of Iraq's security forces," he said.