Chinese authorities have transferred former security chief Zhou Yongkang's corruption case to prosecutors along with 29 other former high-ranking officials, paving the way for his trial.
The deputy secretary of the Central Commission for Discipline Inspection, Huang Shuxian, made the remarks in a statement on its website on January 7.
In early December, Zhou was arrested and stripped of his Communist Party membership on charges of leaking state secrets and taking bribes. The retired member of the elite Politburo Standing Committee is the highest level Chinese Communist official to be prosecuted in more than three decades.
Huang said they are also investigating other high-profile cases, including those of Ling Jihua, former minister of the United Front Work Department, and Su Rong, former deputy chairman of the National Committee of the Chinese People's Political Consultative Conference.
"After the investigation is complete, and if we discover some criminal clues such as abuse of power or accepting bribes, suspects will be transferred to the judicial bodies to face trial," he said.
Meanwhile, Chinese judicial authorities have secured the return of more than 500 economic fugitives, including many alleged corrupt officials from abroad.They have also retrieved more than 3 billion yuan ($480 million) sent overseas illegally.
The 29 other alleged corrupt officials transferred to prosecutors include Jiang Jiemin, former minister of the State-owned Assets Supervision and Administration Commission; Li Dongsheng, former deputy minister at the Ministry of Public Security; Li Chongxi, former chairman of the Sichuan Provincial Committee of the Chinese People's Political Consultative Conference; and Shen Weichen, former Party chief and executive vice-president of the China Association for Science and Technology.
Since November 2012, when the new leadership was elected, the anti-graft campaign has become a top priority for the CPC Central Committee.
President Xi Jinping has vowed to take a series of strong and effective measures to combat corrupt officials, both the "tigers" (senior officials) and "flies" (low-level officials).