### Chinese: 德国刑警正与杜伊斯堡检方、德国联邦航空事故调查局共同调查导致这一事故的原因。
### English: German criminal police are investigating the cause of the accident together with the Duisburg prosecutor and the German Federal Bureau.

### Improved English: German criminal police are investigating the cause of the accident together with the Duisburg prosecutor and the German Federal Bureau of Aircraft Accident Investigation.
