Thousands of rescuers are searching for more than 80 people missing since a massive landslide hit an industrial park in the southern Chinese city of Shenzhen on Dec 20. The landslide is believed to be caused by the illegal dumping of mud and construction waste at a disused quarry nearby. Just four months ago, more than 160 people were killed in big chemical blasts in the northern port city of Tianjin.
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