The death toll from Hurricane Katrina, which ripped through parts of Louisiana, Mississippi and Alabama this week, may be in the hundreds as rescue efforts continue after what U.S. and state officials say may be the nation's worst natural disaster. The U.S. Coast Guard rescued thousands yesterday in the New Orleans area, which remained flooded in water as deep as 20 feet, after rescuing about 1,200 Tuesday, the agency said on its Web site. At least 50 people died in Harrison County, Mississippi, including as many as 30 in a Biloxi apartment building that collapsed, Mississippi Emergency Management spokesman Jim...