The country's former top economic policymaker Liu Tienan has been placed under criminal investigation for suspected bribe-taking.
Xinhua news agency reported yesterday that the Supreme People's Procuratorate had decided to open an investigation into the case of Liu.
The announcement came just days after the ruling Communist Party expelled Liu - once the deputy director of the influential National Development and Reform Commission - amid a high-profile campaign against graft.
On August 8, Xinhua, citing the party's anti-corruption watchdog, said Liu "took advantage of his position to seek profits for others" and was "morally degenerate". "Both Liu and his family accepted huge amounts of bribes," it said.
Liu lost both his party and government posts. Expulsion from the party is normally a precursor to criminal prosecution for mainland officials and yesterday Xinhau said an investigation into Liu was "under way".
President Xi Jinping took office in March vowing to root out corrupt officials ranging from high-ranking "tigers" to low-level "flies" - warning that the problem could destroy the party if left unchecked.
In early July, the former railways minister Liu Zhijun was given a suspended death sentence for corruption.