In this image taken from undated video footage run by China's CCTV via AP Video, Qianbao founder Zhang Xiaolei, center, is interrogated by police while in custody in Nanjing in eastern China's Jiangsu province. Chinese authorities are struggling to quell protests following the collapse of an investment scheme police say took as much as $4.7 billion from millions of depositors. (CCTV via AP Video)