Ethnic Uzbeks, who fled southern Kyrgyzstan, cross the Uzbek-Kyrgyz border as they return to their wrecked homes Thursday in the southern Kyrgyz city of Osh, desperate for food and water that aid agencies have had trouble delivering to the thousands camped out on the border. Deadly inter-ethnic clashes that erupted in Kyrgyzstan a week ago have forced at least 400,000 people to flee the country or their homes, the United Nations said Thursday. __