The 7.0-magnitude quake, Haiti's worst in two centuries, struck on Tuesday.
Mr Preval said the UN mission chief in Haiti was among the dead, but the UN cannot confirm this. It said 14 other UN staff had died and 56 were injured.
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Prime Minister Jean-Max Bellerive told US network CNN he believed more than 100,000 people had died.The Red Cross says up to three million people are affected.
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