Huang Shuxian (C), deputy secretary of the Communist Party of China's (CPC) Central Commission for Discipline Inspection (CCDI), speaks during a press conference summing up China's sweeping counter-corruption campaign in Beijing, capital of China, Jan. 7, 2015. (Xinhua/Yin Gang)

BEIJING, Jan. 7 -- After caging dozens of high-level "tigers" and swatting thousands of lowly "flies", China's anti-graft campaign will continue strong measures to root out corruption, said a senior graft-buster on Wednesday.

Huang Shuxian, deputy secretary of the Communist Party of China's (CPC) Central Commission for Discipline Inspection (CCDI), said cases involving 68 high-level officials are under investigation or have been closed.

According to Huang, the cases involving Zhou Yongkang, Jiang Jiemin, Li Dongsheng, Li Chongxi and Shen Weichen have been transferred to judicial organs, while the cases of Ling Jihua and Su Rong are still under investigation.

　　Huang singled out north China's Shanxi Province, a major coal-producing region in China, saying that some Party organizations in the province should be held accountable for widespread corruption.

　　He also said China will continue to investigate election fraud in Hengyang in central China's Hunan Province, the subject of one of the largest cases in terms of people and money.

The campaign also made efforts in reducing corruption opportunities for discipline inspectors, prosecutors, and others tasked with fighting graft. Huang said 1,575 corrupt graft-busters were rooted out during the campaign.

China also sought international help in hunting those who fled the country, said Huang. China brought back more than 500 fugitive corrupt officials from overseas and recovered more than 3 billion yuan (483 million U.S. dollars) in 2014, said Huang, adding that China has inked deals with several countries to cooperate in fighting corruption, including the United States, Canada and Australia.

Huang said a total of 71,748 Chinese officials were punished in 2014 for violations of the eight-point anti-graft rules.