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“I don’t think anyone knows where Osama bin Laden is,” Gen. Petraeus told NBC’s “Meet the Press.”

He said capturing or killing the terrorist leader is a key task.

Bin Laden issued two audiotapes early this month in which he called for aid for flood victims in Pakistan and for action to prevent climate change.

Al-Zawahri was most recently heard from in an audio recording issued days after this year’s anniversary of the Sept. 11 terrorist attacks.