At least 10 people were killed and 10 others were injured when a bus in which they were travelling collided with a truck in Telangana's Nalgonda district on Wednesday, official said.The incident occurred near Indirapalanagar in Ramannapet mandal of Nalgonda district, about 100 km from here, officials said.The bus belonging to state-owned Telangana Road Transport Corporation was on its way from Bhongir to Nalgonda when it overturned after head-on collision with the speeding truck coming from opposite direction.According to eye-witnesses, the toll may go up as the condition of many injured is critical. The injured were shifted to a hospital at Narketpally.Home Minister N. Narasimha Reddy and Transport Minister Mahender Reddy have left for the accident site.