A Kurdish Peshmerga fighter launches mortar shells towards Zummar, controlled by Islamic State (IS), near Mosul September 15, 2014. [Photo/Agencies]
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"The airstrike southwest of Baghdad was the first strike taken as part of our expanded efforts beyond protecting our own people and humanitarian missions to hit (Islamic State) targets as Iraqi forces go on offense," Central Command said in a statement.
The United States is stepping up its military response to the hardline group, which has beheaded several Western hostages and seeks to expand the territory it controls in Syria and Iraq.