Party committees should be held accountable for mass occurrence of corrupt cases in north China's Shanxi Province, said a senior anti-graft official on Wednesday.

"High-voltage posture will be held to curb corruption," said Huang Shuxian, vice secretary of the Communist Party of China (CPC) Central Commission for Discipline Inspection (CCDI).

According to Huang, suspects have been transferred to judicial organs including Zhou Yongkang, Jiang Jiemin, Li Dongsheng, Li Chongxi and Shen Weichen. Ling Jihua and Su Rong are under investigation.

Since the anti-graft campaign started in 2012, China has finished regular inspection across 31 provincial-level regions as well as in the Xinjiang Production and Construction Corps, effectively exposing discipline violation and corruption, including severe corruption in Shanxi.

Shanxi is one of the major coal producers in China and contributes greatly to the country's energy supply. In 2014, seven of the province's top leaders were put under investigation.

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

In 2014, special inspections have been carried out in 19 ministries, state-owned enterprises and institutions.