An oil pipeline that runs 800 miles from wells at Prudhoe Bay to the port of Valdez.
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The company is on probation after a major Alaskan pipeline spill in 2006.
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The cause of both Alaskan pipeline spills this week remained unknown and under investigation, DEC said.
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Corrosion has plagued Alaskan pipeline infrastructure in the past, causing a number of past shutdowns and spills.
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Traders said if the disruption to the Alaskan pipeline lingers, it could result in shifting crude supplies priced off Brent to the U.S. West Coast.