BBC – One of China’s richest men, Guo Guangchang, is reported to be missing.
Financial magazine Caixin said that staff at Mr Guo’s company, Fosun International, had been unable to contact their boss since Thursday afternoon.
Fosun, one of China’s biggest private conglomerates, halted trading of its Hong Kong shares following the reports.
There is speculation that Mr Guo, described as China’s Warren Buffett, has been detained by the police.
Caixin quoted social media messages saying he had last been seen with police in Shanghai.