The U.S. continues to target al Qaeda's top leader, Ayman al Zawahiri, who has so far evaded the CIA's grasp.

WSJ: Drone Strike Kills al Qaeda No. 2

He has since fallen out with its leaders, particularly Ayman al-Zawahiri, who succeeded him as head of Egypt's Islamic Jihad group.

ECONOMIST: Terrorism

Lest anyone doubt these efforts, Ayman al-Zawahiri, al-Qaeda's second-in-command, has often called on devout Muslims to kill Pervez Musharraf, Pakistan's president.

ECONOMIST: Pakistan: School for terror | The

Following Mr Libi's presumed death, perhaps the only significant figure believed to be left there is Ayman al-Zawahiri, the group's leader since bin Laden's assassination.

ECONOMIST: These days just talking seems accomplishment enough

The New York Times reported Sunday that the Bush administration is considering expanding covert operations in the western part of Pakistan to shore up support for Musharraf's government and to find bin Laden and his second in command, Ayman al-Zawahiri.

CNN: Musharraf: Bhutto to blame for her assassination