Spain's close counterterrorism cooperation with Morocco provides a model for effective international efforts to prevent terrorist attacks.
Latest in al-Qaeda
The presence of international terrorist groups may grow in the months and years ahead, but there are steps the United States can take to mitigate the risks.
Despite rumors of bin Laden's successor's death, the organization remains resilient.
The arrangement can be tense and transactional, but has provided benefits for both sides.
The new secretary of defense's attempt to open negotiations with the Somalia-based al-Qaeda affiliate raises the question: Does the United States have conditions for negotiating with terrorist groups?
Emerging trends in terrorist attacks will present new challenges for agencies working to prevent them.
Are there opportunities to wind down fighting with some terrorist groups in the region?
How a Jamaican preacher now facing extradition to the United States rose through the extremist ranks.
Ten years later, the man who planned the attack is still at large and heading al-Qaeda.