(Bloomberg) — A landslide that left at least 91 people missing in southern China may have started from a man-made pile of earth and construction debris, an initial government investigation showed, drawing new scrutiny to safety practices in China.

The landslide started in an area "mainly used for piling up muck and construction waste," the Ministry of Land and Resources said in a statement on its website. The official Xinhua News Agency said the slide left 91 people missing, while a pipeline supplying natural gas to Hong Kong was also disrupted.

Satellite images of the area from 2013 and April of this year show a mound of earth where a reservoir had once been. The ministry statement said a large amount of the heap had been piled up "too steeply."

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