John Ging, who just returned from a three-day visit to Somalia, said another two million Somalis are considered to be "food insecure."
"These figures are very, very large," he told a news conference. "They tell us a simple message which is that the situation in Somalia for Somalis on the humanitarian side is very grave. It's also very fragile."
Ging said the UN World Food Program's Food Security and Nutrition Analysis Unit reported this month that 8,57,000 Somalis are in acute crisis conditions and require urgent humanitarian assistance. This is "a modest improvement" from the previous six months when 870,000 Somalis desperately needed food, he said.
In recent years it has made some strides in security and governance, particularly since August 2011, when al-Shabab militants were forced out of the capital, Mogadishu. But the al-Qaida linked rebels have not been defeated and the government controls only small parts of the country and is struggling to provide security and battle corruption.
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The food security unit said about 75 per cent of the 857,000 Somalis who urgently need food are displaced from their homes, largely as a result of fighting, insecurity and lack of food. Ging said others are in rural areas that are very hard to access.
The United Nations appealed for USD 933 million for the humanitarian crisis in Somalia this year, but Ging said so far it has received only USD 36 million which is "very ominous."
In 2011, the UN appeal for Somalia was 86 per cent funded, but in 2013 it was just 50 per cent funded, he said.