Tuesday's earthquake has left as many as 50,000-100,000 people dead.
Haitian Prime Minister Jean-Max Bellerive said more than 15,000 bodies had already been recovered and buried, French news agency AFP reported.
The UN has launched a flash appeal for $562m (£346m), saying three million people would need help for six months.
US President Barack Obama described the scale of the devastation as extraordinary and the losses suffered as "heartbreaking".
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