U.S. officials said Tuesday that Abu Yahya al-Libi, effectively the terror network's second-highest leader, was dead.

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Following Mr Libi's presumed death, perhaps the only significant figure believed to be left there is Ayman al-Zawahiri, the group's leader since bin Laden's assassination.

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As for Ibn Sheikh al Libi, who ran the camp where Nasiri trained, Scheuer says Nasiri offers the best portrait of al Libi he has seen.

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He added that Mr. Libi will be difficult to replace.

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The U.S. military has transferred Ibn Al-Shaykh al-Libi, the captured al Qaeda leader who once ran terrorist mastermind bin Laden's training camps in Afghanistan, to the USS Bataan in the Arabian Sea.

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Al Libi would become notorious, after being captured in November 2001, for lying to his interrogators and telling them that al Qaeda was working to get chemical and biological weapons from Saddam Hussein.

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