The Chinese Ministry of Land and Resources said that Sunday morning's Shenzhen landslide was caused by the collapse of a sodden mountain of dirt and construction debris in an industrial area of the town. The New York Times' Austin Ramzy details how the site, a former quarry, had nearly two years of built-up rain-soaked material.
Rapid construction and short building life in China have long led to the unregulated dumping of waste. This site in particular previously exhibited warning signs:
A company based in Shenzhen that conducts site surveys had previously warned of dangers at the site, Chinese news outlets said. The company, Zongxing Environmental Technology, published an environmental impact assessment report in January warning of soil erosion risks that might cause landslides,
For more information on the cause of this landslide, head over to The New York Times: