HASTINGS, Neb. (AP) — A Nebraska school district is reviewing its policies after a 4-year-old girl was left unattended on a bus at the district’s bus garage.

The girl didn’t get off the bus for her preschool Tuesday at Hawthorne Elementary School, in Hastings.

Hastings Public Schools Superintendent Craig Kautz says the girl stayed on the bus and rode back to the facility where buses are housed. She got off the bus after the driver left. A passer-by saw the girl outside the facility and called 911. Authorities eventually took her to the school.

Kautz and police spokesman Brian Hessler said Thursday that they haven’t determined how long the girl was outside the facility before she was seen.