An Exxon Mobil crude oil pipeline ruptured near the town of Mayflower in the US state of Arkansas, spilling thousands of barrels of oil, the company said.
Exxon shut the 50-centimetre Pegasus pipeline, which carries crude oil from Pakota, Illinois, to the Gulf Coast, after the leak was discovered on Friday afternoon.
Exxon, which was hit with a $1.7m fine by regulators this week over a 2011 spill in the Yellowstone River, said a few thousand barrels of oil had been observed.
Local media reported the spill occurred in a subdivision, and Mayflower police said the oil had not reached the nearby Lake Conway.
Federal, state and local officials were on site and the company said it was staging a response for a spill of more than 10,000 barrels "to be conservative."
"The air quality does not likely present a human health risk, with the exception of the high pooling areas, where clean-up crews are working with safety equipment," Exxon said in a statement.
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