SIMI VALLEY, Calif.--A Southern California school district is investigating how a special education student was left alone on a school bus for more than four hours.

The Ventura County Star says it happened last week in the Simi Valley Unified School District.

School board President Janice DiFatta says the child was picked up to attend the first day of school at Crestview Elementary School but somehow wound up alone after the bus driver parked and left the vehicle.

The child wasn't hurt but DiFatta calls the Aug. 22 incident inexcusable. She says the driver has been removed from duty while the district investigates.