KABUL, Afghanistan Afghan President Hamid Karzai told The Associated Press that Mullah Omar, the supreme Taliban leader who headed the repressive Islamist regime ousted by U.S.-led forces five years ago, is hiding in the southeastern Pakistani city of Quetta. Despite U.S. efforts to ease acrimony between two key anti-terror allies, the Afghan leader in an interview late Monday also blamed neighboring Pakistan for a surge in Taliban violence in Afghanistan, and demanded that President Pervez Musharraf crack down on militant sanctuaries.