From BBC News:
One week after China’s richest man was allegedly taken from his home, there is still no official explanation about the reason for his detention either from the authorities or from the companies he controls.
Reports from Beijing say police have confirmed Huang Guangyu was under investigation, but they have declined to give details.
Mr Huang is a legendary figure, a living example of rising from rags to riches.
Born into a poor family from the southern town of Shantou, Guangdong Province, in May 1969, he dropped out of school at the age of 16 and went to Beijing with his elder brother.