Machines work during the oil spill cleanup operation at the seashore near the development zone in Dalian, northeast China's Liaoning Province, July 26, 2010. The key work of the oil spill cleanup operation has turned to seashore since Monday. An explosion hit an oil pipeline on July 16 and triggered an adjacent smaller pipeline to explode near Dalian Xingang Port. Both pipelines are owned by China's No.1 oil and gas producer CNPC. [Xinhua]