BEIJING, July 29  -- The Communist Party of China (CPC) announced on Tuesday an investigation into Zhou Yongkang, the latest and highest ranking "tiger" in the anti-corruption campaign's crosshairs.

The investigation of Zhou, a former Standing Committee member of the Political Bureau of the CPC Central Committee, for suspected "serious disciplinary violations" will be conducted by the CPC Central Commission for Discipline Inspection (CCDI).

Top leaders are resolved to target both high-ranking "tigers" and low-ranking "flies" in their anti-corruption effort. After taking the helm at the CPC in November 2012, Xi Jinping has led efforts in fighting corruption, calling on the whole Party to stay on full alert, and describing corruption as a threat to the Party's very survival. Xi vowed that there would be "no exceptions": No leniency will be meted out no matter who is involved.

The downfall of a "big tiger" like Zhou could have a deterrent effect on Party members and corrupt officials who believe they are immune.According to the CCDI website, around 40 officials of provincial and ministerial level or higher have been investigated for corruption or other serious disciplinary violations since November 2012.

Xu Caihou, former vice chairman of China's Central Military Commission, was expelled from the CPC for bribery last month and may face prosecution.

Also in June, authorities announced the investigation into Su Rong, then vice chairman of the Chinese People's Political Consultative Conference National Committee, who was previously Party chief of several provinces.