The former director of the Urban District Administrative Enforcement Bureau in the city's Guangming district where the landslide disaster took place December 20, jumped off a residential building Sunday night, the Shenzhen Nanshan District public security bureau said on its official Weibo social media account.
Police only identified him by his family name Xu but Caixin, an influential financial magazine identified the official as Xu Yuan'an.
Police and state media have not said whether Xu had been directly responsible for authorizing the dump.
In a statement posted on its official Weibo page, the Shenzhen Public Security Bureau said the police had taken what they call "compulsory measures" against 12 people who should be held responsible for the landslide, including executives of the facility.
State broadcaster CCTV said they had been detained.
No natural disaster
A search of the Shenzhen Guangming District Government website suggested Xu was still director in July 2015 and local media reported that his bureau had approved the waste dump.
Authorities have said that the mountain of construction debris, which swallowed 33 buildings when it collapsed, was a result of safety violations -- not a natural disaster.
"Those responsible for the incident will be seriously punished in accordance with laws and regulations," a state investigation team said Friday.
As of Sunday, rescue crews had pulled out four bodies after the landslide. More than 70 people are still missing.
Rescue effort involves thousands
A massive rescue effort involving 4,000 people
has been underway since the landslide, with hopes dimming daily.
Excavators have been working to clear the rubble, dwarfed by the sheer scale of the landslide. It covered 380,000 square meters (94 acres) -- or around 60 football fields.
Densely packed with few air pockets, the mud and debris were piled four stories tall in some places. In addition to toppled buildings, the landslide also ruptured a gas pipeline, complicating clearance efforts.
The company in charge of the waste dump's construction purportedly raised safety concerns in a January report filed with the municipal government, according to the state-run Legal Evening News. In the report, it said new waste dumps are "urgently" needed.
Local residents told Xinhua that hundreds of trucks carrying construction waste used to dump trash into the pile every day. A security guard working in a factory in the area told Xinhua that a 250-yuan ($38) fee was charged per truck.