Stranded New Orleans residents walk on an interstate ramp past the Superdome.
The effort to aid victims of Hurricane Katrina is one of the largest in U.S. history. Those trapped in New Orleans have lost water pressure and are searching for food. The Pentagon has mobilized 21,000 National Guardsmen, and Navy ships are heading to the area.
New Orleans Mayor Ray Nagin has warned that it will be months before the city has electricity.
Currently, the city is a tangle of stranded residents, little communication, inadequate food and water, and looters on the prowl.