National Incident Management System: Intelligence/Investigations Function Guidance and Field Operations Guide [open pdf - 460KB]
"The I/I [Intelligence/Investigations] Function within ICS [Incident Command System] provides a flexible and scalable framework that allows for the integration of intelligence/investigations information and activities. The post-9/11 world requires an environment that supports the sharing of information across all levels of government, disciplines, and security domains. Situational awareness is enhanced by the I/I Function through the sharing of pre- and post-incident information, intelligence, and real-time incident intelligence and investigation activities. All entities involved in processing and sharing information should develop a common operating picture--both day-to-day and during an incident or planned event."
FEMA, Federal Emergency Management Agency: http://www.fema.gov/