Police in the northern Thai Binh Province are looking for those responsible for the death of a five-year-old boy who was left for 11 hours in a school bus in 35-degree heat.

They have filed charges of involuntary manslaughter and will determine who were culpable in the tragic incident.

According to the police, at around 6:20 a.m. on Wednesday the boy, Gia Huy, was taken from his home to the bus by a teacher responsible for transporting student to the Hong Nhung 2 Kindergarten in Phu Xuan Commune.

The charter bus had nine other students and was driven by a 58-year-old man.

On reaching the school, the driver opened the door to let the teacher and students out, closed the door, parked the bus at the school gate, and left.

The teacher responsible for the class took attendance photos to send to the school’s software and noticed Huy was missing, but failed to inform his family.

At around 5 p.m. that day Huy’s uncle came to pick him up, but the teacher informed him that the boy had not attended school that day.

The uncle ran to the bus parked at the school gate, broke the door with help of some locals, and found the boy still inside, a parent at the school said.

Huy was rushed to the Thai Binh Province General Hospital for emergency treatment but was unfortunately declared dead on arrival.