In the wake of the September 11 attacks in 2001, CTD's funding and manpower have significantly increased.

Larger field offices, such as Los Angeles, maintain counterterrorism squads for each major terrorist group, as well as for domestic terrorism and terrorist financing, while smaller field offices combined such responsibilities across two to three squads.

The ITOS-I covers al Qaeda terrorist activity on a regional basis in the United States and abroad.

The Operational Support Branch manages the CTD's administrative and resource functions, FBI detailees to other agencies, and the Foreign Terrorist Tracking Task Force.

The various local Joint Terrorism Task Forces falls under the domain of this branch.