Zhou's former colleagues who have been probed

Li Dongsheng, former vice minister of public security, was probed in December 2012.

Ji Wenlin, former vice governor of South China's Hainan province, was probed on Feb 18, 2014. Ji was a former secretary of Zhou Yongkang.

Yu Gang, former vice head of the general office of the Commission for Political and Legal Affairs of the Communist Party of China Central Committee, was expelled from the CPC on July 2.

Tan Hong, a former senior officer in the guard bureau of the Ministry of Public Security, was expelled from the Communist Party of Chin on July 2.

Liang Ke, former head of Beijing Municipal Bureau of National Security, was removed from his post on Feb 21.

From Sichuan province

Li Chongxi, former chairman of the top political advisory body in Sichuan province, was probed in December 2013.

Li Chuncheng, former vice secretary of the CPC Sichuan provincial committee, was investigated in December 2012.

Guo Yongxiang, former vice governor of Sichuan province, was probed in June 2013. Guo was a former secretary of Zhou Yongkang.

Tan Li, vice governor of Hainan province who used to work for 37 years in Sichuan, was probed on July 8.

Xu Mengjia, former Party secretary of Ya'an city, was probed in December 2013.

He Huanzhang, former mayor of Suining city, was probed on March 24.

Pu Zhong, former executive vice mayor of Ya'an city, was probed in December 2013.

Wu Lianqi, former vice mayor of Guangyuan city, was expelled from the Party organization in February 2014.

Zou Ping, former vice mayor of Nanchong city, was probed on March 13, 2014.

An Xiaoyu, former vice president of Sichuan University, was probed on December 18, 2013.

Hu Xiangquan, a former official from Sichuan provincial department of agriculture, was probed on Jan 7, 2014.

Wen Jiabi, a former official of Sichuan Society of Red Cross, was probed on Feb 19, 2014.

Wu Tao, former head of the Jinjiang public security bureau of Chengdu city, was tried on Nov 20, 2013.

Yuan Ling, former Party secretary of Peng'an county, was probed in September 2013.

From China National Petroleum Corporation

Jiang Jiemin, former head of the Stateowned Assets Supervision and Administration Commission, was probed in September 2013. Jiang used to work at CNPC for 37 years.

Wang Yongchun, deputy general manager of the CNPC, was probed in August 2013.

Li Hualin, deputy general manager of the CNPC, was probed in August 2013. Li was a former secretary of Zhou Yongkang.

Ran Xinquan, vice president of PetroChina Company Ltd, was probed in August 2013.

Wang Daofu, chief geologist of PetroChina, was probed in August 2013.