Jiang Jiemin, head of the State-owned Assets Supervision and Administration Commission of the State Council, attends a meeting in Beijing on August 22, 2013. File Photo: sasac.gov.cn

Jiang Jiemin, head of the State-owned Assets Supervision and Administration Commission of the State Council, is being investigated over suspected serious disciplinary violations.

China's Ministry of Supervision made the announcement in a notice posted on its official website on Sunday. It did not specify the alleged breaches.

Xinhua news agency also reported on the investigation, saying it had learned the information from the CPC Central Commission for Discipline Inspection (CCDI).

Jiang Jiemin, former board chairman of the China National Petroleum Corporation (CNPC), was appointed head of the State-Owned Assets Supervision and Administration Commission in March.

Earlier, Jiang resigned from the country's largest oil and gas company after former SASAC leader Wang Yong was promoted to China's cabinet.

The 58-year-old became board chairman of the energy giant in 2007 after years of work in the oil industry and a tenure in northwest China's Qinghai Province as vice governor.

Under Jiang's leadership, the CNPC sped up its overseas expansion. The company has actively engaged in cooperation with foreign energy giants in order to tap resources overseas.

Jiang vowed in January that the amount of oil and gas produced overseas would account for 60 percent of the CNPC's total output by 2020, Xinhua reports.

The SASAC now regulates 116 centrally-administered state-owned enterprises and other non-financial state assets in critical industries such as telecommunications, petroleum and mining, Xinhua reports in March.

According to SASAC figures, 116 such enterprises raked in a total of 1.3 trillion yuan (207 billion U.S. dollars) in net profits in 2012, up 2.7 percent year on year. But the growth was slower than the 6.4-percent and 40.2-percent profit expansions recorded in 2011 and 2010, respectively.