Authorities in south central Iowa are investigating a school bus crash that caused minor injuries to several students.

The Iowa State Patrol says the driver of a semitrailer rear ended the bus Tuesday morning on Highway 92, west of Oskaloosa. The semitrailer landed in a ditch.

Des Moines television station KCCI reports four students between the ages of 9 and 15 received minor injuries and were taken to a school nurse.

A crash report says the driver of the semitrailer was blinded by the sun before the crash.

Additional information was not released. The crash remains under investigation.