Rourkela: At least 20 persons, four of them critically, were injured when a bus overturned in Lahunipada area, according to the police. The driver of the Keonjhar-bound bus from Rourkela lost control and hit a tree while taking a sharp turn on NH-23, which led the vehicle to overturn in Lahunipada area, about 85 km from here. The conductor and three passengers who were seriously injured were admitted to hospital. -PTI