The United Nations and the European Union on Tuesday urged Kyrgyzstan not to allow deadly ethnic unrest to derail a key constitutional referendum and parliamentary elections. The southern part of the impoverished Central Asian nation has been convulsed by days of ethnic rioting targeting minority Uzbeks, which has left the country's second-largest city, Osh, in ruins and sent over 100,000 Uzbeks fleeing toward the border. Kyrgyzstan's interim government, which took over when former President Kurmanbek Bakiyev was ousted in an April uprising, has been unable to stop the violence and accused Bakiyev's family of instigating it to halt a June 27 referendum on a new constitution. Uzbeks have mostly backed the interim government, while many Kyrgyz in the south have supported Bakiyev.