Hurricane Katrina probably killed thousands of people in New Orleans, the mayor said Wednesday — an estimate that, if accurate, would make the storm the nation's deadliest natural disaster since at least the 1906 San Francisco earthquake.

"We know there is a significant number of dead bodies in the water," and other people dead in attics, Mayor Ray Nagin said. Asked how many, he said: "Minimum, hundreds. Most likely, thousands."

The frightening estimate came as Army engineers struggled to plug New Orleans' breached levees with giant sandbags and concrete barriers, and authorities drew up plans to clear out the tens of thousands of people left in the Big Easy and practically abandon the flooded-out city.

Many of the evacuees — including thousands now staying in the Superdome — will be moved to the Astrodome in Houston, 350 miles away.

There will be a "total evacuation of the city. We have to. The city will not be functional for two or three months," Nagin said. And he said people will not be allowed back into their homes for at least a month or two.

Nagin estimated 50,000 to 100,000 people remained in New Orleans, a city of nearly half a million. He said 14,000 to 15,000 a day could be evacuated.

The Pentagon, meanwhile, began mounting one of the largest search-and-rescue operations in U.S. history, sending four Navy ships with drinking water and other emergency supplies, along with the hospital ship USNS Comfort, search helicopters and elite SEAL water-rescue teams.

American Red Cross workers from across the country converged on the devastated region in the agency's biggest-ever relief operation.

Katrina slammed into the Gulf Coast on Monday just east of New Orleans with howling, 145-mile wind. The death toll has reached at least 110 in Mississippi alone. But the full magnitude of the disaster had been unclear for days; Louisiana has been putting aside the counting of the dead to concentrate on rescuing the living, many of whom were trapped on rooftops and in attics.

If the mayor's estimate holds true, it would make Katrina the nation's deadliest hurricane since 1900, when a storm in Galveston, Texas, killed between 6,000 and 12,000 people. The death toll in the San Francisco earthquake and the resulting fire has been put at anywhere from about 500 to 6,000.

BUSH: RECOVERY WILL TAKE YEARS

In Washington, President Bush said it would take years to recover from the flooding and devastation sown by Hurricane Katrina.

"We are dealing with one of the worst natural disasters in our nation's history," Bush said after returning early to the White House from his Texas vacation to oversee recovery efforts.

"This recovery will take a long time. This recovery will take years," he said. More than 78,000 people were in emergency shelters, and tens of thousands of homes and businesses were beyond repair, the president said.

GAS PRICES ROCKETING

On his way to Washington from Crawford, Texas, Bush's Air Force One dipped low enough for the president to view the destruction as the plane flew over stricken areas.

The Bush administration declared a public-health emergency in the region and the Pentagon ordered 10,000 more National Guard troops to Louisiana and Mississippi for storm relief, bringing to 21,000 the total deployed in four hurricane-battered states.

The administration also said it would release oil from strategic reserves to offset losses in the Gulf of Mexico, where the storm had shut down production, and it relaxed anti-pollution fuel standards with an aim toward making more gasoline and diesel available.

U.S. crude-oil prices eased below $70 per barrel, but analysts said they expected retail gasoline prices to vault well over $3 a gallon in most parts of the country as early as this weekend.

GLOBAL SUPPORT FOR VICTIMS

From papal prayers to telegrams from China, the world reacted with an outpouring of compassion Wednesday for the victims of Hurricane Katrina in messages tinged by shock that a disaster of this scale could occur in the United States.

Venezuela's government, which has had tense relations with Washington, offered humanitarian aid and fuel if requested.

The storm was seen as an equalizer — proof that any country, weak or strong, can be victimized by a natural disaster. Images of flood-ravaged New Orleans earned particular sympathy in central Europe, where dozens died in raging floodwaters only days ago.

Throughout Europe, concerned citizens lamented the loss of life and the damage caused to New Orleans, often described as one of North America's most "European" cities.

French President Jacques Chirac and German Chancellor Gerhard Schroeder sent messages of sympathy to President Bush. Chirac, who has famously quarreled with Bush over the Iraq war, addressed this letter, "Dear George."

China's President Hu Jintao expressed his "belief that that the American people will definitely overcome the natural disaster and rebuild their beautiful homeland."

Pope Benedict XVI said he was praying for victims of the "tragic" hurricane.

Britain's Queen Elizabeth II also sent a message to Bush saying she was "deeply shocked and saddened" at the devastation caused by the hurricane and expressing her condolences, "especially to the families of those who have lost their lives, to the injured and to all who have been affected by this terrible disaster."

The U.S. Embassy in Bern, Switzerland — a capital at the foot of the Alps hit by flooding last week — said calls were rushing in from Swiss individuals and institutions looking for a way to donate to relief efforts.

"We are getting calls from the Swiss public looking to express their condolences, (and) people are also asking for an account number where they can make donations," said spokesman Daniel Wendell.

AMID SYMPATHY, THERE WAS CRITICISM

As U.S. military engineers struggled to shore up breached levees, experts in the Netherlands expressed surprise that New Orleans' flood systems failed to restrain the raging waters.

With half of the country's population of 16 million living below sea level, the Netherlands prepared for a "perfect storm" soon after floods in 1953 killed 2,000 people. The nation installed massive hydraulic sea walls.

"I don't want to sound overly critical, but it's hard to imagine that (the damage caused by Katrina) could happen in a Western country," said Ted Sluijter, spokesman for the park where the sea walls are exhibited. "It seemed like plans for protection and evacuation weren't really in place, and once it happened, the coordination was on loose hinges."

The sympathy was muted in some corners by a sense that the United States reaped what it sowed, since the country is seen as the main contributor to global warming.

Joern Ehlers, a spokesman for World Wildlife Fund Germany, said global warming had increased the intensity of hurricanes.

"The Americans have a big impact on the greenhouse effect," Ehlers said.

But Harlan L. Watson, the U.S. envoy for negotiations on climate change, denied any link between global warming and the strength of storms.

"Our scientists are telling us right now that there's not a linkage," he said in Geneva. "I'll rely on their information." (Photo Source: Sina)

(Source: AP/Reuters)