BEIJING-- ConocoPhillips China, a subsidiary of the US-based oil company ConocoPhillips, admitted Saturday that nine new oil spill sources have been found from its Penglai 19-3 oilfield Platform C.

The company reported to the North China Sea branch of the State Oceanic Administration (SOA) that it has discovered nine new oil spill sources from the areas within 15 meters north of the Platform C in China's Bohai Bay.

The SOA has asked the company to make a thorough investigation of the cause of oil spills to prevent similar cases.

The oil giant on Friday extended an apology for conduct that led to oil leaks in the Bohai Bay, pledging to accelerate its clean-up efforts and take measures to ensure that similar accidents will not happen in the future.

The company reported to authorities two oil spills in its Penglai 19-3 oilfield in June. It admitted another two oil leaks earlier this month, with one from Platform C and the other from Platform B.