The crash happened just before 9 a.m. Thursday morning near Oak Avenue and Route 20.
No students were on the District U-46 school bus at the time.
Police say a vehicle hit the bus, causing it to turn over.
The offending driver fled the scene on foot.
The bus driver was taken to the hospital with a head injury.
Three schools near the area were placed on "secure building" status. That meant nobody could come into or leave the school.