Letter to the Honorable John M. Spratt, Jr. Regarding Federal Costs Associated with the Terrorist Attacks on September 11, 2001 [open pdf - 169KB]
"In this letter, the Congressional Budget Office has prepared a summary of federal costs associated with the tragic events of September 11, 2001. This information is presented in the attached tables and is based on an analysis of enacted legislation, the President's budget request for fiscal year 2003, and legislative proposals considered in the House of Representatives."
Congressional Budget Office: http://cbo.gov