A former top-level government official and a Hong Kong property billionaire involved in one of the city's biggest corruption scandals were at the anti-graft agency's offices briefly on Tuesday (April 10) morning.<br/> <br />Rafael Hui, the former No. 2 official in the Hong Kong government, made a brief stop at the Independent Commission Against Corruption (ICAC).<br/> <br />Soon after Hui left, Sun Hung Kai co-chairman, Thomas Kwok, stopped by at the ICAC.<br/> <br />Thomas Kwok, his brother Raymond, and Rafael Hui were arrested on March 29 on suspicion of corruption, though no charges have been filed and they are free on bail.<br/> <br />Local media say Hui and Thomas Kwok went to the ICAC on Tuesday to extend their bail, adding that Raymond Kwok had already visited the anti-corruption headquarters.<br/> <br />The brothers are worth $18.3 billion, according to Forbes magazine.<br/> <br />The ICAC can call the Kwoks in for questioning as many times as it wishes during the course of its investigation.<br/> <br />The agency then hands the information it has gathered over to Hong Kong's department of justice, which decides if it has enough evidence to prosecute.<br/> <br />Such investigations can take months to assemble.<br/> <br />Shares of Sun Hung Kai Properties, Asia's top property developer, have lost roughly $5 billion or around 15 percent of their market value since the arrests.<br/> <br />The investigation is the biggest case launched by the ICAC since it was set up in 1974 to root out graft.
