China's marriage law forbids polygamy and its one-child policy allows a second child only under special circumstances.
In May, a couple in eastern China's Zhejiang Province who had a second child were fined 1.3 million yuan (206,677 U.S. dollars).
Li married Hu Yongxian in 1989 and had four children with her. Li had six more children with another three women. Li forged a marriage certificate when helping one of the women obtain residence registration, according to an investigation by the Taiyuan municipal government.
Under family planning rules, a child born outside of marriage cannot get residence registration. However, nine of Li's children had obtained residency certificates, according to the investigation.
Police will further investigate Li's suspected bigamy, it said.
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