Smoke rises from the site of U.S.-led air strikes in the town of Sinjar, November 12, 2015. Kurdish forces launched an offensive on Thursday to retake the northern Iraqi town of Sinjar from Islamic State militants who overran it more than a year ago, killing and enslaving thousands of its Yazidi residents and triggering U.S.-led air strikes. REUTERS/Ari Jalal FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE.