keywords: qaeda zawahri jazeera al afghanistan
text: Qaeda's Zawahri Appears in New Tape on Al Jazeera  DUBAI (Reuters) - Ayman al-Zawahri, the number two figure  in al Qaeda, appeared in a new videotape aired on Al Jazeera on  Thursday, ridiculing U.S. forces which he said were "hiding in  their trenches" in Afghanistan.