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Mullah Mohammed Omar, the one-eyed leader of the Afghan Taliban, has fled a Pakistani city on the border with Afghanistan and found refuge from potential U.S. attacks in the teeming Pakistani port city of Karachi with the assistance of Pakistan's intelligence service, three current and former U.S. intelligence officials said.

Mullah Omar, who hosted Osama bin Laden and other al Qaeda leaders when they plotted the Sept. 11, 2001, attacks, had been residing in Quetta, where the Afghan Taliban shura -- or council -- had moved from Kandahar after the U.S. invasion of Afghanistan in 2001.

Two senior U.S. intelligence officials and one former senior CIA officer told The Washington Times that Mullah Omar traveled to Karachi last month after the end of the Muslim holy month of...