A Tri-County elementary school student was killed this morning when hit by a vehicle while waiting to get on a stopped school bus. Authorities say it happened on State Highway 73 near 11th Avenue, just southeast of Plainfield. Officials say the school bus was stopped around 7:15, when another vehicle, travelling in the same direction as the bus, hit two people. A 6 year old kindergarten student was killed, and a sibling was injured. There were other students on the bus at the time of the accident. The State Patrol is investigating. No other details have yet been released.