Port-au-Prince.– While hundreds of bodies were stacked outside the city morgue and limbs of the dead protruded from the rubble of crushed schools and homes, the Haitian Red Cross and government officials estimated that nearly 50,000 people were killed in Tuesday's cataclysmic earthquake.

Aid workers hoping to distribute food, water and other supplies to a shattered Port-au-Prince are warning their efforts may need more security as Haitians grow increasingly desperate and impatient for help.

A few workers were able to free people who had been trapped under the rubble for days, but others attended to the grim task of using bulldozers to transport loads of bodies.

United Nations peacekeepers patrolling the capital said people's anger is rising that aid hasn't been distributed quickly, and the Brazilian military warned aid convoys to add security to guard against looting.

Across the sprawling city, people milled about in open areas, hopeful for help, sometimes setting up camps amid piles of salvaged goods, including food scavenged from the rubble.

Small groups could be seen burying dead by roadsides. Other dust-covered bodies were being dragged down streets, toward hospitals where relatives hoped to leave them. Countless dead remained unburied, some in piles.