A purge of corrupt officials has been launched in Shenzhen after a vice-chairman of its Municipal People's Congress and two senior officials from the land administration bureau were put under investigation for graft. Shenzhen People's Congress vice-chairman Wang Ju and two of his proteges in the city's land bureau, deputy bureau chief Pang Zehong and planning department director Cai Jianhui are under shuang-gui, Shenzhen city government officials said. This means they will be interrogated and will have to report to investigators at specific times. Wang and the other two men allegedly accepted bribes worth millions of yuan, sold land and contracted out development projects to relatives or associated companies in order to solicit private gain, the officials said. 'A document issued by the Central Disciplinary Inspection Committee was circulated last Thursday to senior city government officials as well as to senior officials at the land administration bureau,' a Shenzhen official said. 'It said the trio had been suspended from duty to help with the investigation on economic violations,' the official said. Wang, 58, was alleged to have abused his position when he was the city's deputy mayor - in charge of city construction and town planning - by contracting out a subsidised-housing development project to a company run by his daughter and son-in-law. Wang and the two land bureau officials were also alleged to have illegally fixed land deals and given contracts to 'connected' companies in return for bribes and expensive gifts. The illegal transactions were said to have enabled Wang's children and associates to make millions of yuan in profit. The circular called on Shenzhen officials, especially those in the land administration bureau, to be co-operative and provide information during the investigation. The Central Disciplinary Inspection Commission has dispatched dozens of investigators to Shenzhen to probe the scam, which is expected to implicate more officials. All documents of the land administration bureau are under review. Weibai Shareholding Company, a real estate development company set up by Wang's daughter and son-in-law has been shut down by investigators. Wang, an engineer, has been a Shenzhen construction expert since the early 1980s. In internal briefings, Shenzhen leaders told officials that Wang had made a contribution to the city's construction and that it was unfortunate that Wang, his family and the two officials from the land administration bureau now had to go through a corruption investigation. Wang was said to have shown a good attitude to the investigation. He has yet to be expelled from the Shenzhen Municipal People's Congress, of which he became vice-chairman last month after stepping down as the city's deputy mayor. It is not known if he will be charged. The graft investigation signalled the beginning of a series of anti-corruption probes in the border city which has just completed a reshuffle of its leadership. In the circular from the central Government, party leaders assured Shenzhen leaders that the anti-graft campaign would not hamper the Special Economic Zone's future development.