A 3-year-old New Hampshire boy was left alone on a school bus this week when the driver did not notice the youngster after delivering other kids to preschool.

Chris Castano said his son, Nicholas, was unnoticed as the driver ran errands on Monday, and locked inside alone for 45 minutes while the driver visited with her mother.

Castano told Foster's Daily Democrat his son was dropped off at home in Somersworth, N.H., on schedule late Monday morning, but the driver did not mention the incident. The parents learned about it from the school district.

Special Education director Bob Marquis said the bus company told him the driver had been disciplined.

Castano said the youngster told him he did not call to the driver because he was being patient and waiting to be unbuckled.

Somersworth is about 70 miles north of Boston.