A Hong Kong Falun Gong follower who was jailed on the mainland after trying to sue President Jiang Zemin for cracking down on the sect has disappeared, fellow members said yesterday. Furniture dealer Chu O-ming, 43, has not been seen since mainland authorities told his family he had been released from Beijing's Fangshan No 2 Detention Centre. He had been detained for more than a month. 'Over 60 practitioners have been tortured to death on the mainland,' said Hui Yee-han, spokesman for the Hong Kong Association of Falun Dafa. 'I am worried that he might be like them.' Last Saturday, Mr Chu's family was told by police that he had been released at about 10pm the night before. They were also asked to pick up his personal belongings left at the detention centre. However, Mr Chu did not contact his family and his whereabouts are unknown. When his family went to the centre and demanded information, the officer on duty said he had been released and was no longer there. Ms Hui said the group had not been able to contact Mr Chu's family since his disappearance. The businessman was arrested on September 7 with fellow adherent Wang Jie, 37, days after they filed a case against Mr Jiang and other senior officials at the Supreme People's Procuratorate. Other followers do not know the fate of Mr Wang, a mainlander. Ms Hui said there were other Hong Kong residents being held on the mainland, 'but usually they are released after being detained for one or two days, or they would be sent immediately to Hong Kong. It is terrible what [the authorities] did. According to the law, they should notify the family within 24 hours after the arrest, but the first notification they gave was on October 13'. Mr Chu is a Hong Kong permanent resident and holds an SAR passport. He spends most of the time in Beijing and does not have any family in Hong Kong. An official at the detention centre declined to comment on Mr Chu's whereabouts, saying: 'It is not a simple issue. You have to ask the government department in charge of Falun Gong affairs.' The Security Bureau said Mr Chu was under 'residential surveillance' in Beijing. A spokesman for the Immigration Department said the Government's office in Beijing was closely monitoring developments regarding the missing follower.