PORT-AU-PRINCE (Reuters) – Tens of thousands of people were feared dead in Haiti’s catastrophic earthquake, with many buried or trapped in demolished schools, hospitals and hillside shanties in the impoverished capital.

Haitians wandered broken streets in Port-au-Prince on Wednesday sobbing or dazed, or tried to rescue people trapped under rubble, clawing at chunks of concrete with bare hands.

Asked by a CNN reporter how many people had died, President Rene Preval replied “I don’t know”, adding “up to now, I heard 50,000 … 30,000.”

But Preval did not say where the estimates came from.

The local Red Cross — used to dealing with disaster in a country long dogged by poverty and political instability — said it was overwhelmed.

A five-story U.N. headquarters building was destroyed by Tuesday’s 7.0 magnitude quake, which the U.S. Geological Survey said was the most powerful in Haiti in more than a century.

The U.N. said at least 14 members of its 9,000-strong peacekeeping mission had been killed. Preval said mission chief Hedi Annabi was dead but the U.N. could not confirm that.

Preval called the damage “unimaginable” and described stepping over dead bodies and hearing the cries of those trapped in the collapsed Parliament building, where the senate president was among those pinned by debris.

Destruction in the capital was “massive and broad,” and tens — if not hundreds — of thousands of homes were destroyed, a spokesman for the U.N. mission said.

Voices cried out from the rubble.

“Please take me out, I am dying. I have two children with me,” a woman told a Reuters journalist from under a collapsed kindergarten in the Canape-Vert area of the capital.

The presidential palace lay in ruins, its domes fallen on top of flattened walls. Preval and his wife were not inside when the quake hit.

GROUND STILL TREMBLING
The quake’s epicenter was only 10 miles from Port-au-Prince. About 4 million people live in the city and surrounding area. Many slept outside on the ground, away from weakened walls, as aftershocks as powerful as 5.9 magnitude rattled the city throughout the night and into Wednesday.

“We have a lot of people here that need help. They need food, they need water,” said Vanessa Charlamagne, a 27-old Haitian-American lab technician visiting from Maryland, who spent the night with hundreds of others on the grass of a park near the palace.

Haitian Red Cross spokesman Pericles Jean-Baptiste said his organization was overwhelmed and out of medicine. “There are too many people who need help … We lack equipment, we lack body bags,” he told Reuters.

Normal communications were cut off, roads were blocked by rubble and trees, electric power was interrupted and water was in short supply.

The poorest country in the Western Hemisphere, Haiti is ill-equipped to respond to such a disaster, lacking heavy equipment to move debris and sufficient emergency personnel.

RESCUERS EN ROUTE
“I am appealing to the world, especially the United States, to do what they did for us back in 2008 when four hurricanes hit Haiti,” Raymond Alcide Joseph, Haiti’s ambassador to Washington, said in a CNN interview.

“At that time the U.S. dispatched … a hospital ship off the coast of Haiti. I hope that will be done again … and help us in this dire situation that we find ourselves in.”

U.S. President Barack Obama called the quake an “especially cruel and incomprehensible” tragedy and pledged swift, coordinated support to help save lives. The Pentagon was sending a nuclear-powered aircraft carrier and three amphibious ships, including one that can carry up to 2,000 Marines.

Medical aid group Doctors Without Borders said its three hospitals in Haiti were too badly damaged to use, and it was treating the injured at temporary shelters.

“The reality of what we are seeing is severe traumas, head wounds, crushed limbs, severe problems that cannot be dealt with the level of medical care we currently have available with no infrastructure really to support it,” said Paul McPhun, operations manager for the group’s Canadian section.

The University of Miami School of Medicine sent a plane full of doctors and nurses to set up a field hospital.

The World Bank pledged an additional $100 million. The United Nations said $10 million would be released immediately from the its central emergency response fund and it would organize a flash appeal to raise more money for Haiti over the next few days.

The United States, China and European states were sending reconnaissance and rescue teams, some with search dogs and heavy equipment, while other governments and aid groups offered tents, water purification units, food and telecoms teams.

NOWHERE TO GO
The quake hit at 5 p.m. (2200 GMT), and witnesses reported people screaming “Jesus, Jesus” running into the streets as offices, hotels, houses and shops collapsed. Experts said the quake’s epicenter was very shallow at a depth of only 6.2 miles, which was likely to have magnified the destruction.

Witnesses saw homes and shanties built on hillsides tumble as the earth shook, while cars bounced off the ground. “You have thousands of people sitting in the streets with nowhere to go,” said Rachmani Domersant, an operations manager with the Food for the Poor charity.

Haiti’s cathedral was destroyed and media reports said the archbishop of Port-au-Prince, Monsignor Joseph Serge Miot, had been found dead in the wreckage of the archdiocese office.