Mental depression is to blame for the death of a senior Chinese civil aviation official who committed suicide last week, a source close to the aviation industry revealed Tuesday.

The official, Liu Yajun, chief of Central and Southern Regional Administration (CSRA) of Civil Aviation Administration of China (CAAC), reportedly killed himself Thursday afternoon on a railway in front of an oncoming train, according to sources with Guangzhou-based China Southern Airlines and Baiyun Airport.

No evidence of corruption was found with Liu, the source said.