Smoke rises after a shell lands Monday in Kobani in Syria as fighting intensifies between Syrian Kurds and the militants of Islamic State group, as seen from the outskirts of Suruc, at the Turkey-Syria border. Militants with Islamic State group on Wednesday shot down an Iraqi military attack helicopter, killing the two pilots on board in the second such incident in a week and raising concerns about the extremists' ability to attack aircraft amid ongoing U.S.-led airstrikes. (Lefteris Pitarakis / AP)