Shu did not want to answer questions from police officers and doctors, the report said.

He is now in an isolation ward on the fifth floor of the hospital, with several security guards defending the entrance to his room.

"Only those approved by authorities can enter to see Shu," a security guard told China Daily on Monday afternoon. The local health department has established a special task force of experienced doctors and experts to help treat Shu and investigate how his kidney was removed.

Police in Dongguan are investigating the case, a police officer from Dongguan public security bureau said.

He said the case would be made public when the investigation has come to an end.

The case has raised great concern from home and abroad after local media reported it late last week.

Insiders said Shu might have sold his left kidney after failing to find a job in the city.

Doctors said they had contacted Shu's parents in Chongqing, and his father said he would rush to Dongguan to see his son, Nanfang Daily reported.

"My son just told me he wanted to leave home for Guangdong to seek job opportunities, but he has never said or hinted that he wanted to sell his kidney," the newspaper quoted his father assaying.

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