Given the following news article:
A huge rescue operation was under way this morning after a powerful earthquake hit Haiti, toppling buildings in the capital Port-au-Prince, burying residents in rubble and sparking tsunami alerts in what is feared to be a major catastrophe. A 7.0-magnitude quake – the biggest recorded in this part of the Caribbean – and the largest to hit Haiti in more than 200 years, rocked Port-au-Prince last night, collapsing a hospital and sending houses tumbling into ravines. Hundreds are feared to have been killed. Witnesses reported seeing bodies in the rubble and clouds of dust shrouding the city, but with telephone communications cut the extent of damage was not immediately clear. The quake, which was shallow, with a depth of just 6.2 miles, struck at 4.53pm local time with the epicentre 10 miles south-west of Port-au-Prince, according to the US Geological Survey. It was said to have lasted around a minute and was quickly followed by two strong aftershocks of 5.9 and 5.5 magnitude. The last major temblor to hit the capital was a magnitude 6.7 in 1984. The size and proximity to heavily populated slum areas made NAME_1, a quake specialist at the University of Southern California, fear the worst. "It's going to be a real killer." The headquarters of the UN Peacekeeping Mission in Haiti sustained "serious damage" and a large number of UN personnel in Haiti are unaccounted for, the UN peacekeeping chief said last night. Before telephone lines were broken, NAME_2, a Catholic Relief Services representative, told US-based colleagues that "there must be thousands of people dead," the aid group reported. The Pacific Tsunami Warning Center ruled out a major tsunami but said coasts up to 60 miles away might be affected, prompting alerts in neighbouring Dominican Republic, Cuba and the Bahamas. Haiti, a former French colony which forms half of the island of Hispaniola, is especially vulnerable to natural disasters. Most of the capital's 3 million people live in hillside slums made of wood, tin and cheap concrete. A local employee for the US charity Food for the Poor reported seeing a five-storey building collapse in Port-au-Prince. A colleague said there were more houses destroyed than standing in Delmas Road, a major thoroughfare. The hospital in Petionville, a well to do neighbourhood, home to diplomats and expatriates, was wrecked. As darkness fell survivors filled the streets trying to dig people from rubble with their bare hands and improvised tools. 

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