Story highlights As many as 73 people are still missing

16 people have been hospitalized

(CNN) A mountain of construction debris that swallowed cars and buildings in China was a result of safety violations -- not a natural disaster, state media said.

Rescue crews have pulled out four bodies after the landslide in Shenzhen on Sunday.

As many as 73 people are still missing, according to CNN's calculations based on Chinese media.

State investigators say they have determined the landslide was caused by unsafe conditions, according to the Xinhua news agency.

"Those responsible for the incident will be seriously punished in accordance with laws and regulations," a state investigation team said Friday.

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