HIAWATHA, Kan. (AP) — The Kansas Highway Patrol says a school bus driver is to blame for a wreck that injured more than 20 students last week.

WIBW-TV reports that the driver failed to stop at an intersection south of Hiawatha on Nov. 18. Highway Patrol says the driver was attempting to turn onto the highway when the bus went off the side of the road and rolled one time.

Investigators did not find any mechanical problems with the bus and cited the cause of the crash as “driver error.”

The investigation into the incident is ongoing.

The Highway Patrol will turn their findings over to the Brown County Attorney’s Office to see if charges are warranted.