IMPERIAL, Neb. -- The driver of a school bus involved in a serious crash with a semi in southwest Nebraska on Tuesday has been cited. 

Keith Cranwell of Champion, who was driving the Chase County Schools bus, was cited for failure to yield the right of way and careless driving. He is due in court next month. 

The Chase County Sheriff's Office said the school bus driver tried to make a left-hand turn when it collided with a semi pulling a fully loaded grain trailer. 

The semi hit the rear passenger side of the school bus, causing it to overturn. 

After hitting the bus, the semi continued a short distance before leaving the roadway, crossing the ditch, and coming to rest on a rural property. 

There were 12 students on board, three were transported to regional trauma centers and remain in the hospital. 

The other children were treated and released from the hospital.