Department of Homeland Security Critical Infrastructure Reporting Guide

The Department of Homeland Security's Terrorist Threats to the U.S. Homeland - Reporting Guide for Critical Infrastructure and Key Resource Owners and Operators is available, at least for a little while, online.

From the introduction to this uncopyrighted federal government publication:

"This Terrorist Threats to the U.S. Homeland Reporting Guide for Critical Infrastructure and Key Resource Owners and Operators (TTRG) was jointly produced by the Federal Bureau of Investigation (FBI) and the Department of Homeland Security (DHS). The purpose of this document is to leverage the vast information resources of our critical infrastructure partners, in recognizing activities or conditions that may be indicative of terrorist activity. State and local organizations and the owners and operators of our nation’s critical infrastructure are on the front line in the war against terror and therefore have a critical role as primary sources of threat-related information. Timely and relevant information from the 'front lines' is critical to the development of insights into terrorist plans and intentions, and subsequent disruption of their operations."

The document is unclassified.