Several countries have dispatched their rescue teams to Haiti to begin the search operations for those who are still buried under the rubble of collapsed buildings following a devastating quake.The United Nations Peacekeeping Mission in Haiti (MINUSTAH) has appealed for immediate assistance and the UN in New York will issue a flash appeal for aid in the coming days. UN peacekeeping Chief Alain Le Roy said the Chinese team will reach the Caribbean country shortly.The top UN official on humanitarian affairs John Holmes told journalists that two US teams were also expected to reach the country in a few hours.Other countries, including France, Iceland and Dominican Republic are also sending their help and rescue teams.An earthquake of 7.3-magnitude rocked the Caribbean nation of Haiti on Tuesday and damaged presidential palace besides other government buildings in the country's capital Port-au-Prince.The country's prime minister warned the death toll may top 100,000 in a calamitous quake which left streets strewn with corpses and thousands missing in a scene of utter carnage. Latest reports indicate that between 50 and 100 people, who were in the six-storey building of the UN headquarters in Haiti when it collapsed, have yet to be accounted for. Other UN offices have also been damaged, and 10 people are missing from the United Nations Development Programme compound.The UN World Food Programme is airlifting an additional 86 metric tonnes of food from its emergency hub in El Salvador, including energy biscuits, to sustain thousands of people over seven days.The UN has already released USD 10 million in emergency aid.New Delhi says all Indians in Haiti are reportedly safe. The External Affairs Minister S.M. Krishna gave this information to reporters on Wednesday evening. There are 200 Indians in Haiti, most of them part of the UN Peace Keeping Mission. The earthquake at magnitude seven had particularly deadly impact because it just struck ten kilometers below the earth's surface. This meant that the ground shook with a force that poorly constructed buildings could not withstand. Despite other recent natural disasters, Haiti is not accustomed to major tremors . There has been no significant earthquake there for more than hundred years. President Obama has described as heartbreaking the plight of those affected by what he called cruel and incomprehensible tragedy. He offered Haiti the unwavering support of the American people. He said he has directed his Administration to respond with a swift, coordinated and aggressive effort to save lives. He said the people of Haiti would have support of the American people in the urgent effort to rescue those trapped beneath the rubble and to deliver the humanitarian relief – food, water and medicine – that Haitians need in coming days.