Report of the 9/11 Commission

Problems in the FBI
From the time of the first World Trade Center attack in 1993, FBI and Department of Justice leadership in Washington and New York became increasingly concerned about the terrorist threat from Islamist extremists to U.S. interests, both at home and abroad. Throughout the 1990s, the FBI's counterterrorism efforts against international terrorist organizations included both intelligence and criminal investigations. The FBI's approach to investigations was case-specific, decentralized, and geared toward prosecution. Significant FBI resources were devoted to after-the-fact investigations of major terrorist attacks, resulting in several prosecutions.

The FBI attempted several reform efforts aimed at strengthening its ability to prevent such attacks, but these reform efforts failed to implement organization-wide institutional change. On September 11, 2001, the FBI was limited in several areas critical to an effective preventive counterterrorism strategy. Those working counterterrorism matters did so despite limited intelligence collection and strategic analysis capabilities, a limited capacity to share information both internally and externally, insufficient training, perceived legal barriers to sharing information, and inadequate resources.