Those detained include the couple suspected of shooting the video — in the changing room of a Uniqlo store in the capital.
The clip rapidly spread on China's Twitter-like Weibo and mobile messaging service WeChat, with scores of people taking selfies outside the outlet
"The police investigation has two main parts: who published this unsavoury video, and was it an example of hype by the business (Uniqlo)," it added.
China's online regulator the Cyberspace Administration of China (CAC) said late on Wednesday that distributing the footage was "against socialist core values".
6 hrs ago
Do the young people have no other diversions to fill their time.
8 hrs ago
communist china is mimmiking in all aspects.of west.
17 hrs ago
How is porn against socialist values? Socialism has no opinion on porn.
18 hrs ago
so much porn is available, why make hue and cry
20 hrs ago
Five people were taken away by police including the man and woman who played the main role," the channel said in a report broadcast late last week.