A worker cleans up leaked oil after last week's explosion of a Sinopec Corp oil pipeline in Huangdao, Qingdao, Shandong Province November 25, 2013. China has launched a broad investigation into safety at oil and gas pipelines, state media reported on Monday, as the death toll from an explosion at a Sinopec pipeline last week rose to 52. REUTERS/Aly Song (CHINA - Tags: DISASTER ENERGY ENVIRONMENT)