Exxon shut the 20-inch Pegasus pipeline, which carries crude oil from Pakota, Illinois, to the Gulf Coast, after the leak was discovered on Friday afternoon. Exxon said a few thousand barrels of oil had been observed.
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Local media reported the spill occurred in a subdivision, and city of 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 U.S. Environmental Protection Agency had categorized the rupture as a "major spill," Exxon said, and 22 homes were evacuated following the incident.
Clean-up crews had recovered approximately 4,500 barrels of oil and water.