Officials ended their door-to-door sweep for corpses, finding far fewer bodies than once feared and school children returned to classes as New Orleans revved up efforts to recover from Hurricane Katrina.

Soldiers toting M-16s strengthened their grip on this swamped city as concerns grew about the risks posed by the toxic floodwaters and officials braced for what could be a staggering death toll by readying 25,000 body bags.

Using the unmistakable threat of force, police and soldiers went house to house to try to coax the last 10,000 or so survivors of Hurricane Katrina to leave storm-shattered New Orleans because of the risk of disease from the putrid, sewage-laden floodwaters.