The development is a major setback for the F.B.I. in a decade-long struggle to escape a paper-driven culture and replace antiquated computer systems that have hobbled counterterrorism and criminal investigations. Robert S. Mueller III, the bureau’s director, along with members of the Sept. 11 commission and other national security experts, have said the success of that effort is critical to domestic security.
“It’s immensely disappointing to learn of this type of failure,” Lee H. Hamilton, the vice chairman of the Sept. 11 commission, said in an interview. “The F.B.I. cannot share information and manage their cases effectively without a top-flight computer system, and we on the commission got assurances again and again from the F.B.I. that they were getting on top of this problem. It’s very, very disappointing to see that they’re not.”