At least 7 persons, including three children, were killed while more than 54 persons got injured when a school bus going towards Patratu for a marriage function turned turtle at a sharp turn near Pithoria Police Station in Patratu valley, merely 20 km from State Headquarters Ranchi on Sunday afternoon. The driver according to the people on board was drunk, who lost control over it at a sharp turn and dashed into the railing beside the road.