A helicopter spreads chemicals to contain oil spill from an exploded tanker during an exercise aimed to test the ability of China's emergency agencies to protect the ocean environment, in the Bohai Sea off the Qinhuangdao coast, North China's Hebei Province, June 5, 2007. It was the largest ever exercise of oil emergency control in China, which involved 500 people, 20 vessels and two aircraft. [newsphoto]

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