Bush urged Americans to curb gasoline consumption to ease the impact of refineries crippled by the storm. He also warned Gulf Coast residents, including those searching for water and food, not to break into businesses or commit other crimes during the crisis.
"There ought to be zero tolerance of people breaking the law during an emergency such as this," Bush said in an interview on ABC's "Good Morning America."
The deepening crisis prompted urgent pleas for help from local officials and residents, many of whom pointedly criticized the federal government for what they said was a meager and slow response.
Parents carried small children, and grown children carried their elderly parents through the flotsam. Corpses floated in fetid waters and lay amid the crowds of refugees
"This is a horrible tragedy and an unconscionable way to treat human beings,"
If people need water and food, we're going to do everything we can to get them water and food," Bush added. "It's very important for the citizens in all affected areas to take personal responsibility and assume a kind of a civic sense of responsibility so that the situation doesn't get out of hand, so people don't exploit the vulnerable."
The calls for calm came amid increasing signs of unrest among those who remain stranded in New Orleans. Continued engineering difficulties have kept 80 percent of the city flooded for more than three days.
"They said they're doing it by quadrant and we'll just have to take a number and get in line," Cunningham said. "They are there without food. Some were on dialysis and needed medical attention. . . . Their lives are threatened. I'm not even sure they'll be alive when we get there."