(CFP)

Jiang Jiemin, Board Chairman of China National Petroleum Corp. (CNPC), China's largest oil and gas producer and supplier, received a stern warning from the State Council of China on November 24 due to his leading responsibility in a series of serious fire accidents at CNPC's subsidiary in Dalian Harbor, northeast China's Liaoning Province, from 2010 to 2011.

There were four severe oil blasts and fire accidents at CNPC's Dalian Oil Dock in the past 17 months, which led to heavy losses and casualties. The first and most serious accident which occurred on July 16, 2010, and caused a large oil spill and polluted nearby seawater. The accident killed a firefighter, a worker and injured two others. It caused an estimated 223 million yuan ($35 million) in economic losses.

Jiang, 56, served as vice governor of northwest China's Qinghai Province from 2000 to 2004. He became the chairman of PetroChina Co. Ltd. in May 2007 and was appointed as board chairman of CNPC in November 2011.