The operator of the Keystone oil pipeline has restarted the system after a spill onto farmland in North Dakota last week shut down the line.

The Keystone Pipeline resumed operations Monday at a reduced pressure as cleanup efforts continue from an oil spill in North Dakota. The Pipeline and Hazardous Materials Safety Administration said it approved operator South Bow’s plan to restart the pipeline,

U.S. federal regulators have ordered the Calgary-based operator of the Keystone Pipeline to take several corrective actions after a rupture caused more than 556,000 litres of oil to spill onto farmland in North Dakota.