US-POLITICS-OBAMAPresident Barack Obama said Thursday the humanitarian crisis atop a barren hill in northern Iraq is over, eliminating the need for a risky U.S. rescue mission. But Iraqis elsewhere face a “dire” threat from an advancing Islamic army, he said. Obama said the U.S. will work with other governments to provide humanitarian relief “wherever we have capabilities” and can effectively reach those in need, even as U.S. warplanes continue a limited, defensive campaign of airstrikes. Hundreds of thousands of Iraqis have been driven from their homes since June as the militants seized swaths of territory in northern Iraq. More