This image provided by IntelCenter shows a television frame grab of al Qaeda's No. 2 leader Ayman al-Zawahri in a video posted Wednesday Sept. 15, 2010 on militant websites. (AP Photo/IntelCenter)

This image provided by IntelCenter shows a television frame grab of al Qaeda's No. 2 leader Ayman al-Zawahri in a video posted Wednesday Sept. 15, 2010 on militant websites. (AP Photo/IntelCenter)