Ji Jianye, mayor of Nanjing, East China's Jiangsu Province, has been placed under an internal disciplinary probe by the Communist Party of China's top disciplinary watchdog over economic violations, news portal people.com.cn reported late Wednesday.
Ji, 56, has been the mayor of Nanjing since 2010.
Officials in Nanjing were not surprised about the investigation on Ji, as he conducted a huge amount of urban renovations and infrastructure construction in Nanjing in the past few years, drawing complaints from the public that the city's rich historical heritage was being destroyed.
Ji was allegedly related to illicit money exceeding 20 million yuan ($3.3 million), said local media professionals in Nanjing, according to the news portal.
Insiders also told people.com.cn that Ji was involved in the case of Zhu Xingliang, a businessman in Suzhou who was recently arrested.
Ji's last public appearance was as recent as Tuesday, when he chaired a standing committee meeting for the city government, discussing improvement measures for a sewage diversion project, according to the website of the city's People's Congress.
Ji is the latest in a string of senior officials placed under Party investigation since the new leadership launched its anti-graft campaign in the past few months.