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The extent of the devastation is still unclear but there are fears thousands of people may have died.

Haiti's worst earthquakequake in two centuries hit south of the capital Port-au-Prince on Tuesday, wrecking the presidential palace, UN HQ and other buildings.

A "large number" of UN personnel were reported missing by the organisation. Many people have spent the night outside amid fears of more aftershocks.

The Red Cross says up to three million people have been affected.

Describing the earthquake as a "catastrophe", Haiti's envoy to the US said the cost of the damage could run into billions.

A number of nations including the US, UK and Venezuela are gearing up to send aid.

The powerful earthquake of 7.0 magnitude that hit Haiti yesterday may have affected up to 3 million people, with the worst damage in the capital Port-au-Prince and nearby coastal city of Jacmel.

UNICEF staff in Haiti are providing emergency aid, including supplies of clean water and sanitation facilities. The first wave of UNICEF emergency supplies enough for 10,000 families have already been airlifted into Port-au-Prince. This includes 10,000 tarpaulins, 4,600 water containers, 5.5 million water purification tablets, more than half a million oral rehydration sachets, tents and trauma kits. Further supply flights will arrive over the coming days.