** FILE ** This frame-grabbed image from video provided by the SITE Intel Group, an U.S. private terrorist-threat-analysis company, purports to show al Qaeda leader Ayman al-Zawahri on a Web posting on Sunday, Feb. 12, 2012. (AP Photo/SITE Intel Group)

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** FILE ** This frame-grabbed image from video provided by the SITE Intel Group, an U.S. private terrorist-threat-analysis company, purports to show al Qaeda leader Ayman al-Zawahri on a Web posting on Sunday, Feb. 12, 2012. (AP Photo/SITE Intel Group)