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Newly intercepted messages from senior al Qaeda operatives are renewing concerns for terrorist attacks in the Middle East and overseas in 2014. CNN's Barbara Starr reports.
The civil war in Syria has reached new lows of chaos and violence as the Syrian opposition continues to fracture between moderate rebels and Islamist extremists - with the Islamists gaining the upper hand. CNN's Jim Sciutto reports on the deteriorating state of the opposition.
Is al Qaeda more of a threat now than before September 11th? CNN's Brian Todd investigates the growing threat from the terror group and one of their most important commanders.
This week, many lawmakers on Capitol Hill are challenging the Obama administration's support for the rebels in Syria, questioning their ties to al Qaeda and other Islamist extremist groups. CNN's Tom Foreman and military analyst Lt. Col. Rick Francona break down the many rival factions within the Syrian opposition and their different goals.
Al Qaeda's U.S.-born spokesman Adam Gadahn calls for attacks on American ambassadors. CNN's Brian Todd reports.
CNN's Tom Foreman joins former General James A. "Spider" Marks to discuss military preparedness against terrorism.
Brian Todd reports on Ibrahim al-Asiri, al Qaeda's master bomb-maker who could be involved in this current threat.
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Officials say al Qaeda's leader ordered a terrorist act, and that is what led to the closure of U.S. embassies.
RELATED STORY: Source: al Qaeda leader urged affiliate to 'do something'
A former U.S. soldier is charged with terror offenses after he allegedly helped an al Qaeda-linked rebel group in Syria. CNN's Jill Dougherty reports.
RELATED STORY: U.S. ex-soldier charged with using RPG for al Qaeda group