The official death toll from the twin earthquakes that struck La Guaira has climbed to 3,899, with 16,740 injured and 17,907 homeless.The United Nations launched a $300 million appeal to help 1.3 million people as the World Food Program and Pan American Health Organization mobilized emergency funding and field clinics.Officials say physical damages may total about $37 billion, the International Monetary Fund is negotiating to unblock foreign assets, and aid workers warn that logistics, sanitation and scarce finance are blocking recovery.