At least 46 people have been killed in an ethnic conflict in Osh, the second-largest city in Kyrgyzstan. Hundreds of youths battled with guns and steel bars, setting shops ablaze in the city in what is the worst outbreak of violence in the Central Asian state since the president was overthrown in April.The troubled nation's interim government, which hosts US and Russian military bases, has declared a state of emergency in Osh and several local rural districts. A spokeswoman for the Kyrgyz Health Ministry said 646 people had been injured, 419 of whom were in hospital.The Government, led by Roza Otunbayeva, sent troops and armoured vehicles to quell gangs roaming the streets with sticks, stones and petrol bombs after a night of violence.