Al Qaeda leader Ayman al-Zawahiri is seen here in a still image from a web posting by the terrorist group's media arm, as-Sahab, on July 27, 2011. (Associated Press)
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Al Qaeda leader Ayman al-Zawahiri is seen here in a still image from a web posting by the terrorist group's media arm, as-Sahab, on July 27, 2011. (Associated Press)
