UN humanitarian chief Valerie Amos, in Manila, praised the international community's response to Super Typhoon Haiyan but insisted much more needed to be done to help people hit by a catastrophe her organisation fears may have already killed 10,000.
"We've just launched an action plan focusing on the areas of food, health, sanitation, shelter, debris removal and also protection of the most vulnerable with the government and I very much hope our donors will be generous," she told reporters.
"At this point in time it's extremely difficult even to get a sense of what the immediate needs are because it is very difficult to get to some of the areas affected."
The UN estimates that more than 11.3 million Filipinos have been affected, with 673,000 made homeless, since Haiyan -- one of the most powerful typhoons ever -- smashed into the nation's central islands on Friday.
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Britain boosted its aid to 10 million pounds (USD 15.8 million) and sent a destroyer from Singapore, as well as a transport plane.
The European Commission said it would give 13 million euros (USD 17 million) while India said it was sending an aircraft with 15 tonnes of relief materials.
The United Arab Emirates, which has a large Filipino expatriate community, pledged $10 million.
China, where the typhoon killed several people, is to give USD 100,000 towards the aid effort. The state-run Global Times said a territorial row with the Philippines should not affect such decisions.