Zhang Guoqing, the former mayor of Chongqing, was appointed acting mayor and deputy mayor of Tianjin.
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Tianjin has ambitions to become a financial hub for northern China and is one of four areas designated a municipality, along with Beijing, Shanghai and Chongqing, giving it the same high status as a province.
The former deputy mayor of Tianjin, Yan Qingmin, has been appointed as vice chairman of the China Securities Regulatory Commission.