Rescuers work at the landslide site of an industrial park in Shenzhen, south China's Guangdong Province, Dec. 20, 2015.
Photo taken on Dec. 20, 2015 shows the landslide site of an industrial park in Shenzhen, south China's Guangdong Province.
Photo taken on Dec. 20, 2015 shows the landslide site of an industrial park in Shenzhen, south China's Guangdong Province.
Photo taken on Dec. 20, 2015 shows the landslide site of an industrial park in Shenzhen, south China's Guangdong Province.
Rescuers discuss rescue plan at the landslide site of an industrial park in Shenzhen, south China's Guangdong Province, Dec. 20, 2015.
A landslide hit an industrial park in Shenzhen city in South China's Guangdong province Sunday morning, crushing several buildings.
Rescue work is underway after a landslide hit an industrial park in Shenzhen city in South China's Guangdong Province Sunday morning, crushing several buildings.
Rescue work is underway after a landslide hit an industrial park in Shenzhen city in South China's Guangdong Province Sunday morning, crushing several buildings.
Rescue work is underway after a landslide hit an industrial park in Shenzhen city in South China's Guangdong Province Sunday morning, crushing several buildings.
Rescuers work at the landslide site of an industrial park in Shenzhen, south China's Guangdong Province, Dec. 20, 2015.
Rescuers work at the landslide site of an industrial park in Shenzhen, south China's Guangdong Province, Dec. 20, 2015.
Rescuers work at the landslide site of an industrial park in Shenzhen, south China's Guangdong Province, Dec. 20, 2015.
Rescuers work at the landslide site of an industrial park in Shenzhen, south China's Guangdong Province, Dec. 20, 2015.
An evacuated boy rests at a makeshift shelter place located at a sports center in Shenzhen, south China's Guangdong Province, Dec. 21, 2015.
Cheng Yiquan, a cement factory worker, receives treatment at Guangming new district hospital after surviving the fatal landslide.
A boy who survived a fatal landslide receives treatment at Guangming new district hospital in Shenzhen city, South China's Guangdong Province.
Evacuated people rest at a makeshift shelter place located at a sports center in Shenzhen, south China's Guangdong Province, Dec. 21, 2015.
Evacuated people rest at a makeshift shelter place located at a sports center in Shenzhen, south China's Guangdong Province, Dec. 21, 2015.
Evacuated people rest at a makeshift shelter place located at a sports center in Shenzhen, south China's Guangdong Province, Dec. 21, 2015.

A landslide struck the Hengtaiyu industrial park in Shenzhen, Guangdong Province, on Sunday, Dec. 20, burying 33 buildings and leaving more than 100,000 square meters of debris at the site. As of Monday, at least 91 people are still missing.

According to the Ministry of Land and Resources, the landslide was caused by the accumulation of huge pile of soil and not by a natural cause. The area is a dump site for soil and construction wastes.

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The Chinese cabinet has sent groups to coordinate rescue efforts in the disaster site. But due to unfavorable conditions like mud, rain and low nighttime visibility, rescue operations are taking much longer.