• The viral Uniqlo sex video has drawn people to the clothing store’s Sanlitun, Beijing branch.

The viral Uniqlo sex video has drawn people to the clothing store’s Sanlitun, Beijing branch. (Photo : Twitter/@freddufour_afp)

A week after investigating, the Chinese police have detained four people who allegedly uploaded the sex video taped in Uniqlo’s store. The clothing store told Chinese media that their staff members were not among those detained.

Beijing police said that the detainees included a 19-year-old man who uploaded the video. The other three who “spread obscene messages” were also taken into custody, the police said, without giving further details.

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The one-minute clip showed a clothed man and a naked woman having sex inside a changing room of Uniqlo’s flagship store in Beijing.

The police investigation was concentrated on who published the “unpleasant” clip.

Authorities said that they were “still dealing with” the two people doubted of filming the video, but did not state if they were being held.

A chat log on WeChat suggested that the two are not dating and the filming of the video was their first-ever encounter.

Chinese media had earlier reported that police had detained the two on Wednesday night, just hours after the footage went viral.

The video was taken in April but was not uploaded online until the two shared it with their friends via WeChat recently, police said.

"The two people in the obscene video had sex in the fitting room in mid-April and used a cell phone to film their activity," Beijing police said in a statement about the preliminary results of their investigation.

The clip then circulated fast on China’s social media, with many people taking selfies outside the Uniqlo outlet, some imitating poses seen in the clip.

The Cyberspace Administration of China said on Wednesday that spreading the footage was “against socialist core values.” The authorities ordered senior managers of Weibo’s operator Sina and WeChat’s owner Tencent to work side by side in an investigation.