The authorities are investigating a security company that helps local officials illegally detain desperate citizens who come to the capital to file complaints against them, the state news media reported Monday. According to China Daily,...the company’s employees posed as police officers and dragooned petitioners into “black jails,” where they were held and sometimes beaten until they could be hauled back to their homes in other provinces. The Chinese government has repeatedly denied that such extralegal detention centers exist. News about the company, Anyuanding Security Technology Service, was published by Caijing and Southern Metropolis Daily... According to their reports, the company...employs 3,000 “interceptors” whose job is to ensnare petitioners before they can reach the central government bureaus where grievances are filed. According to Southern Metropolis Daily, the Beijing Municipal Public Security Bureau detained two of Anyuanding’s executives and charged them with “illegally detaining people and illegally operating a business.”...The company, whose Web site was taken down over the weekend, could not be reached...Human rights groups said they were encouraged by the detention of Anyuanding’s executives, but...“The fact is that the problem of black jails goes far beyond one company,” Phelim Kine, an Asia researcher at Human Rights Watch, said...