Sunni insurgents expanded their push along the borders of Iraqi Kurdistan, a semiautonomous region in Iraq’s north, as thousands of people besieged by the militants on a mountainside received fresh aid supplies. The group calling itself Islamic State , which began a new offensive this week that brought it to 25 miles from the Kurdish capital Erbil, seized a town farther north called Sheikhan, closer to the Kurdish-controlled province of Dohuk . The militants appear to be trying to connect the towns they have seized along the 650-mile border of Kurdish-controlled territory, an advance that has alarmed the Kurdistan Regional Government and panicked the residents of this region. The advance came after two rounds of U.S. strikes aimed at halting […]