This was reported by Kyodo.
It is clarified that the cause of the incident was a burning truck, smoke from which impaired visibility in the tunnel.
The bus driver has passed away. It is noted that a vehicle traveling from Yokohama to Chiba Prefecture crashed into a truck.
Previously, a bus carrying 18 children had fallen off the road to a dividing lane in Fukuoka Prefecture, Japan. As a result of the incident, seven people were injured.