A school bus and semi crashed yesterday afternoon around 4:30 at the junction of Highways 20 and 37 west of Conde. 61 year old Harold Gerdes of Hecla was headed eastbound on highway 20 driving a semi hauling concrete railroad ties. The school bus, driven by Orrin Freeman of Mellette was stopped at a stop sign and proceeded across highway 37. The school bus failed to yield to the semi. The school bus skidded into the ditch and struck a utility pole. There were 4 passengers on the bus, 2 nine year old females who suffered serious, non life threatening injuries and 2 six year old females who suffered minor injuries. All were transported to Avera St. Luke’s hospital. No school bus passengers were ejected. Both drivers were wearing seatbelts.