January 13, 2010 1:32 p.m. EST
* Two key U.N. staffers among missing in Haiti
* U.N. compound damaged by devastating quake that hit near Port-au-Prince
* About 250 people work in the building, there are 6,000 U.N. peacekeepers in country
* Haiti hit by major quake Tuesday plus a series of aftershocks
(CNN) -- More than 100 employees of the United Nations' mission in Haiti were unaccounted for Wednesday after the earthquake that caused massive damage to the country's capital, Port-au-Prince, U.N. officials said.
Among the missing were the chief of the U.N. mission in Haiti, Hedi Annabi of Tunisia, and his deputy special representative, Kim Bolduc of Canada. U.N. Secretary-General Ban Ki-moon told reporters in New York.
The grim list of destruction from Tuesday's quake included the U.N. peacekeeper compound, a five-story building where about 250 people work every day.
Ban said the U.N. headquarters at the Christopher Hotel collapsed in the quake, and that people are still trapped inside. He said possibly 100 or 150 people were in the building around the time the quake struck.
At least 15 peacekeepers are reported to have died: The Brazilian Army said 11 of its soldiers were killed.
Video: 'The ground was pitching'
Video: 'Like the end of the world'
Gallery: Devastation from Haiti earthquake
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* Earthquakes
* Haiti
Three Jordanian peacekeepers died and 21 were injured, according to Jordan's state-run Petra News Agency. An Argentine member of the peacekeeping team also is confirmed dead, the Argentine military said
About 3,000 members of the U.N. peacekeeping force are based in Port-au-Prince and its outskirts, while another 6,000 are in the rest of the country.
Read more about the devastation
The world body "is still in the process of gathering information on the extent of the damage and the status of U.N. personnel," said Alain Le Roy, the U.N. under-secretary-general for peacekeeping operations.
The Argentine military also said that one member of its contingent in Haiti was unaccounted for, but was believed to be several kilometers from downtown Port-au-Prince.
According to state-run Telam news agency, the Argentine military contingent includes 14 members of the U.N. peacekeeping mission and six who handle security at the Argentine Embassy.
Tuesday's 7.0-magnitude quake struck shortly before 5 p.m. local time on Tuesday, and was centered about 10 miles (15 kilometers) southwest of the capital Port-au-Prince, the U.S. Geological Survey reported.
The International Red Cross estimated that over three million people in the impoverished nation had been affected.
Aid groups were scrambling to help but none of the three aid centers run by Doctors Without Borders is operable, the group said, and the organization is focusing on re-establishing surgical capacity so it can deal with the crushed limbs and head wounds it is seeing.
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