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It was also among the first news outlets to report on China's network of "re-education camps" in Xinjiang, where thousands of Uyghur Muslims have allegedly been detained - a charge Beijing denies.

Hours later, tracker Flightrader24 showed an unscheduled China Southern Airlines flight leaving Bangkok, eventually arriving in Xinjiang.

The family was detained in Thailand in 2014 after fleeing increasing repression in their hometown in China's Xinjiang province.

One of the biggest challenges Shein faces is accusations that it sources cotton from China's Xinjiang region.

The allegations have led to some big fashion brands, including H&M, Nike, Burberry and Adidas, removing products using Xinjiang cotton, which has led to a backlash in China, and boycotts of the companies.