Extremists marked the 12th anniversary of the Sept. 11 attacks with propaganda and cake.
Extremists are using Twitter and Facebook to discuss how better to spread their message.
One theory holds that Zawahiri is attempting to reassert control over a network that's pulling at the seams.
Who counts as al-Qaeda?
Charting the terrorist group's rising and ebbing relationships across Africa, the Middle East and Asia.
Potential communication between al-Qaeda's leaders and the rebels could deepen fears about Syria after Assad.
Analysts are navigating a dense web of overlapping and sometimes contradictory questions, mysteries, and datapoints.
A revealing domestic debate about whether or not the Benghazi attackers qualify as members of the group.