Foreign companies are increasingly wary of doing business in Chinese cities such as Shanghai, where GroupM’s offices were raided. Photo: Ying Tang/Zuma PressChinese police have raided the Shanghai offices of GroupM, a media-investment group and unit of London-based WPP , and detained an advertising executive, said a person familiar with the matter. Police questioned other local executives during the raid, including GroupM’s Chief Executive in China Patrick Xu, the person said.

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Persons: Ying Tang, China Patrick Xu Organizations: Zuma Press, WPP, Police, GroupM’s Locations: Shanghai, London, China