Jan. 13, 2006 — Today, according to Pakistani military sources, U.S. aircraft attacked a compound known to be frequented by high level al Qaeda operatives. Pakistani officials tell ABC News that al Qaeda leader Dr. Ayman al-Zawahiri, Osama bin Laden's top lieutenant, may have been among them. U.S. intelligence for the last few days indicated that Zawahiri might be in the location or about to arrive, although there is still no confirmation from U.S. officials that he was among the victims.