A file still image taken from video footage shows top Bin Laden aide Ayman al-Zawahri who may have been surrounded in Pakistan March 18, 2004. Pakistan forces may have al Qaeda number two Ayman al-Zawahri surrounded in a remote tribal region near the border with Afghanistan, a senior Pakistani government official said on Thursday. Al-Zawahri is shown in an archive image displayed during the broadcast of an audio taped message, by al-Jazeera television, purportedly by al-Zawahri urging more attacks on Americans, May 21, 2003. REUTERS/al-Jazeera Television JV