One of the last groups taken out Sunday was a family of six that included 3-year-old twins. The Coast Guard planned to resume evacuation flights this morning.

Earlier in the evening, a civilian helicopter crashed near the Danziger Bridge, but the two people on board escaped with only cuts and scrapes, according to Mark Smith of the state office of emergency preparedness.

In Sunday's confrontation, 14 contractors on their way to help plug the breech in the 17th Street Canal were traveling across the bridge under police escort when they came under fire, said John Hall, a spokesman for the Army Corps of Engineers. Police shot at eight people carrying guns, killing five or six, Deputy Police Chief W.J. Riley said. None of the contractors was injured, authorities said.

In addition to the lawlessness, civilian deaths and uncertainty about their families, New Orleans' police have had to deal with suicides in their ranks. Two officers took their lives, including the department spokesman, Paul Accardo, who died Saturday, according to Riley. Both shot themselves in the head, he said.

"I've got some firefighters and police officers that have been pretty much traumatized," Mayor Ray Nagin said. "And we've already had a couple of suicides, so I am cycling them out as we speak. . . . They need physical and psychological evaluations."

The strain was apparent in other ways. Aaron Broussard, president of Jefferson Parish, dropped his head and cried on NBC's "Meet the Press."

"The guy who runs this building I'm in, emergency management, he's responsible for everything. His mother was trapped in St. Bernard nursing home, and every day she called him and said, 'Are you coming, son? Is somebody coming?' And he said, 'And yeah, Momma, somebody's coming to get you. Somebody's coming to get you on Tuesday. Somebody's coming to get you on Wednesday. Somebody's coming to get you Thursday. Somebody's coming to get you on Friday' — and she drowned Friday night. She drowned on Friday night," Broussard said.

"Nobody's coming to get her, nobody's coming to get her. The secretary's promise, everybody's promise. They've had press conferences — I'm sick of the press conferences. For God's sakes, shut up and send us somebody."

Hundreds of thousands of people already have been evacuated, seeking safety in Texas, Tennessee and other states. The first group of refugees who will take shelter in Arizona arrived Sunday in Phoenix. With more than 230,000 already in Texas, Gov. Rick Perry ordered emergency officials to begin preparations to airlift some of them to other states that have offered help.

What will happen to the refugees in the long term was not known.