Osh , Kyrgyzstan ( CNN ) -- Kyrgyzstan will investigate allegations that government troops were involved in ethnic violence , an official said Sunday . Col. Kursan Asanov , appointed by the Kyrgyz interim government to run the reconciliation operation in the southern city of Osh , did not say whether the investigation would include independent investigators . Asanov said that a government-imposed curfew in Osh that was due to expire Sunday had been extended to Friday . The curfew stretches from 6 p.m. to 6 a.m. ( 10 a.m. to 10 p.m . ET ) . Ethnic violence between Kyrgyz and Uzbeks has displaced 300,000 people inside Kyrgyzstan and forced 100,000 more to flee Kyrgyzstan , the office of the U.N. High Commissioner for Refugees estimated . The clashes , which erupted last week , were the most serious outbreak of ethnic violence in the former Soviet republic since 1990 , when hundreds of people died in Osh . The Kyrgyz news agency Kabar said Friday that 191 people died in the violence but Roza Otunbayeva , the acting president of Kyrgyzstan , said that toll should be multiplied by 10 , according to the Russian news website Kommersant . She said many deaths in the countryside were not part of the official total of yet . Refugees fleeing Kyrgyzstan 's surge of ethnic violence have accused the central Asian nation 's security forces of carrying out some of the deadly attacks . Emerging video and witness accounts point to units of the Kyrgyz military taking part in the violence . Uprooted people on both sides of the Kyrgyzstan-Uzbekistan border said they are frightened by the Kyrgyz military . Zuhra Khuchkarova , 48 , said her son was killed not by an angry mob , but by the Kyrgyz Army on a killing rampage . `` He was shot in the street by soldiers sitting on top of a tank , surrounded by Kyrgyz men , '' she said . `` He was just 23 and had a pregnant wife . Now he 'll never see his child . '' She was sure it was the military , she said . No one else has tanks . Hikmat said soldiers protected people at first , but then turned and shot peaceful Uzbek civilians . Ikromjon , too , said he saw Kyrgyz troops spray a crowd with bullets in the southern city of Osh . The two only gave first names because they did not want to be identified . The refugees spoke of homes and businesses burned by rampaging militias , bodies in the streets and how their relatives were killed . And they shared video footage captured on their cell phones . One began with a crowd of Kyrgyz men , facing their ethnic Uzbek rivals . A few seconds in , there are gunshots and cheers . `` Hurray , they 're coming , '' someone shouts in Kyrgyz , as an armored personnel carrier drives into the area amid more gunfire . In the pandemonium , a voice can be heard shouting : `` They 're using live bullets , not blanks . '' An aide to the interim president said he heard reports that Kyrgyz security forces were involved in shooting Uzbeks based on their ethnic background . However , he said he was not speaking on behalf of the government and that he believed the reports were mainly rumors and provocations . U.S. Assistant Secretary of State Robert Blake , who toured a refugee camp near the Uzbekistan border , urged the government to ensure a fair probe into the violence . `` I think that 's going to be a very important element . Both a very substantial investigation and also that the perpetrators are held accountable , '' said Blake , the top American diplomat for Central Asia . Blake said he wants Kyrgyzstan authorities to investigate who carried out the attacks on ethnic Uzbeks and to bring those responsible to justice . Many refugees have found shelter along the Uzbekistan border in squalid refugee camps where food and medicine are in short supply . The U.N. World Food Programme planned to airlift food over the weekend to augment ongoing distributions . Starting Sunday , planes will carry 110 tons of high-energy biscuits from the agency 's warehouse in Dubai to the region -- enough to provide daily rations for 206,000 refugees and displaced people , the agency said Saturday . The United Nations announced a $ 71 million emergency appeal for food , medicine and shelter for 500,000 victims of the violence that broke out on June 10 . While many are encamped along the border , many are trapped in neighbourhoods in Osh . `` With a huge number of people displaced by the conflict , and thousands more trapped without food , water or supplies , there 's not a moment to lose , '' said Josette Sheeran , executive director of the WFP .
Government plans investigation of claims that troops were involved in ethnic violence . Officials say curfew imposed in Osh extended until Friday . One woman says Kyrgyz army killed son . Government aide : Reports of Uzbeks shot by Kyrgyz are rumors .