BEIJING - Four officials from Tianjin city and Guizhou Province have been placed under investigation on suspicion of corruption, China's Supreme People's Procuratorate (SPP) said on Wednesday.

The highest ranking of the four is Wu Xuemin, former general manager of Hong Kong Jinlian group. A procuratorate in Tianjin has decided to prosecute Wu after completing an investigation.

The suspect from Guizhou is Yang Dehua, former vice mayor of Tongren City. The local procuratorate has decided to investigate Yang on suspicion of taking bribes.

The other two from Tianjin are Shi Jizhuang, former deputy head of Heping District, and Zhang Hongbao, former deputy head of Dongli District.Local procuratorates have started investigating them.

Shi and Zhang have been placed under "coercive measures" which include summons by force, bail, residential surveillance, detention and arrest.