In this photo taken Wednesday, July 21, 2010, workers clean and collect crude oil near a polluted beach after a pipeline explosion in Dalian in northeast China's Liaoning province. China National Petroleum Corp. said Thursday the vital pipeline has resumed operations after an explosion caused the country's largest reported oil spill. (AP Photo)

In this photo taken Wednesday, July 21, 2010, workers clean and collect crude oil near a polluted beach after a pipeline explosion in Dalian in northeast China's Liaoning province. China National Petroleum Corp. said Thursday the vital pipeline has resumed operations after an explosion caused the country's largest reported oil spill. (AP Photo)