Exxon spill highlights gaps in pipeline oversight

An ExxonMobil contractor cleans up oil along the banks of the Yellowstone River in Billings, Mont., Sunday, July 3, 2011. A company pipeline about 20 miles upriver near Laurel, Mont., ruptured and spilled an estimated 1,000 barrels of crude into the Yellowstone on Saturday. (AP Photo/Matthew Brown)
July 21, 2011 5:25:24 AM PDT
Three weeks after a broken Exxon Mobil pipeline spilled 1,000 barrels of oil into the Yellowstone River, federal officials remain unsure how many pipelines carrying hazardous fuels cross the nation's rivers and streams, nor can they say how deeply those pipelines are buried.

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