"Since September 2001, the United States has been concerned with radical Islamist groups in Southeast Asia, particularly those in the Philippines, Indonesia, Malaysia, Thailand, and Singapore that are known to have ties to the Al Qaeda terrorist network. As detailed in the Final Report of the National Commission on Terrorist Attacks Upon the United States (known as the '9/11 Commission'), Southeast Asia is a base for past, current, and possibly future Al Qaeda operations. For nearly fifteen years, Al Qaeda has penetrated the region by establishing local cells, training Southeast Asians in its camps in Afghanistan, and by financing and cooperating with indigenous radical Islamist groups. Indonesia and the southern Philippines have been particularly vulnerable to penetration by anti-American Islamic terrorist groups. […] Although the recommendations in the 9/11 Commission's final report do not touch on Southeast Asia directly, many of the recommendations for U.S. counterterrorism policy in general are applicable to Southeast Asia."
CRS Report for Congress, RL31672