The United Nations said on Friday that .6 billion was **w needed to face a "looming catastrophe" in Yemen where a Saudi-led coalition has been launching air strikes against Houthi fighters in a campaign to restore the government in exile. "Over 21 million people or 80 percent of the population are **w estimated to be in need of some form of humanitarian aid and or protection," U.N. spokesman Jens Laerke told a news briefing. Stephen O'Brien, U.N. Under-Secretary-General for Humanitarian Affairs, launched the revised funding appeal, telling do**rs that a "looming catastrophe" was in the making across Yemen with families struggling to find food, he said.