The U.S. envoy for Central Asia urged Kyrgyzstan on Saturday to create conditions for a safe return of hundreds of thousands of refugees uprooted by last week's outburst of ethnic violence, Reuters reported. The clashes have killed up to 2,000 people and set off a massive wave of refugees, with 400,000 people crammed in squalid camps with little access to clean water and food on Kyrgyzstan's sun-parched border with Uzbekistan. Assistant Secretary of State Robert Blake, speaking after talks with Kyrgyz officials, said an international investigation must be held into the possible causes of the violence. "It is important for the provisional government to establish the atmosphere of trust and security so the refugees in Uzbekistan and the internally displaced persons in Kyrgyzstan can feel confident that they can return to their homes and live in safety and harmony with their Kyrgyz neighbours," he said. -- SPA