More than 380,000 gallons of oil spilled from the Keystone pipeline in North Dakota this week, one of the largest onshore crude spills in the past decade.

The rupture struck the pipeline in Edinburg in the northeast section of the state, TC Energy said in a statement.

The oil affected about 2,500 square yards of land, about half the size of a football field, the company said. The numbers of gallons that spilled out could fill about half an Olympic-sized swimming pool, according to their statement.

“Our crews will remain focused on oil recovery and then prepare to make repairs to the pipeline,” the company added in the statement.

The exact amount of oil spilled from the pipeline will not be determined until after the cleanup process has finished, the company said.

The spill affected wetland habitats in the area, according to the North Dakota Department of Environmental Quality.

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