GARDINER — A Maine school district is investigating after a 5-year-old boy was found wandering alone along a roadway, apparently trying to get home after being left on a school bus.

The Kennebec Journal reports a police officer gave the boy a ride home Tuesday after he was spotted by a good Samaritan near the school bus barn in Gardiner.

Superintendent Patricia Hopkins said the district has protocols meant to prevent children from being left behind on buses. She said they are investigating what went wrong.

Hopkins said, by law, she could not discuss potential consequences for the bus driver if the investigation finds wrongdoing.