A tragic accident has raised questions after a 10-year-old boy attending a special needs school in Komatsu City went missing during class and was later found dead in a nearby waterfall. According to the school, the boy had a relatively mild disability and had no difficulty communicating. However, three years ago he had left the school building through the main entrance on his own. Since then, the school said it had strengthened supervision of students and ensured that doors remained locked.