At least 36 U.N. employees, including chief of the U.N. mission in Haiti, Hedi Annabi, have died, with at least 150 still unaccounted for, said U.N. Secretary General Ban-Ki Moon, who briefed reporters Thursday morning.
"It's highly likely to be the highest mortality count we've ever had," former President Bill Clinton, the UN's Special Envoy to Haiti, told ABC News' George Stephanopoulos Wednesday evening.
One of the many iconic images of the quake has been the flour-like dust covering the faces of the survivors walking the streets, dazed, wounded, crying for help, digging out their family members amid rubble and clusters of dead bodies piling the streets.
In an interview with the Washington Post, Dunois Jean-Baptiste spoke of Tuesday's horror, recalling the "huge dust cloud and big rumbling. ... We heard people calling for help."
Social networking sites were overloaded with updates about the Haiti earthquake. Richard Morse, frequently updating on Twitter from Haiti wrote this morning, "I'm hearing planes and or helicopter. Yesterday there were none to speak of. Changes the atmosphere. I hope there is help on the ground."
Thousands of U.N. peacekeepers were on patrol trying to maintain law and order in and around Port-au-Prince and assisting with humanitarian relief. Rescue teams from countries including France, China, United States and the Dominican Republic were working on the ground.
Kirit Radia contributed to the reporting of this story.