According to the government, cases in which children leave school before the age of 16 are investigated.
No one has died and the cases are still being investigated.
"We continue to investigate the case because it is a public matter."
It said they had a right to know if the case was being investigated.
The police investigated the case and kept it open because no body was ever found.
As a result, most criminal cases in the state never get investigated by the defense.
Things go wrong and the 3 decide to investigate the case as a group.
He said the information had come from police officers investigating the case.
The agency is working with Chinese health officials to investigate the case further.
Each case should be investigated to the full extent possible.