Correction Appended

NEW ORLEANS, Sept. 8 - Local police officers began confiscating weapons from civilians in preparation for a forced evacuation of the last holdouts still living here, as President Bush steeled the nation for the grisly scenes of recovering the dead that will unfold in coming days.

Police officers and federal law enforcement agents scoured the city carrying assault rifles seeking residents who have holed up to avoid forcible eviction, as well as those who are still considering evacuating voluntarily to escape the city's putrid waters.

"Individuals are at risk of dying," said P. Edwin Compass III, the superintendent of the New Orleans police. "There's nothing more important than the preservation of human life."

Although it appeared Wednesday night that forced evacuations were beginning, on Thursday the authorities were still looking for those willing to leave voluntarily. The police said that the search was about 80 percent done, and that afterward they would begin enforcing Mayor C. Ray Nagin's order to remove residents by force.