WASHINGTON — Fighters for the Islamic State were managing to blend in with disenfranchised Sunni populations in some Iraqi towns and villages near the capital, raising the chances of militant attacks against targets in Baghdad, President Obama’s top military adviser said on Sunday. “I have no doubt there will be days when they use indirect fire into Baghdad,” the adviser, Gen. Martin E. Dempsey , said in an interview with “This Week” on ABC. Indirect fire refers to the use of mortar, rockets or artillery. General Dempsey, the chairman of the Joint Chiefs of Staff, said American military officers still think that an outright assault on Baghdad remains unlikely, but that strikes from a distance by militants infiltrating areas near the capital could greatly heighten the sense of insecurity in Iraq’s most important city. Iraqi and American officials believe the Islamic State has already carried out some car-bomb and […]