What happened

A pipeline employee heard a bang and saw oil coming from the 30-inch Keystone pipeline south of a pump station near Fort Ransom, North Dakota; the line was shut within about two minutes. South Bow estimated about 3,500 barrels (147,000 gallons) spilled into a farm field, most of which was recovered. PHMSA issued a corrective action order with pressure restrictions on 11 April; the pipeline restarted on 16 April after regulatory approval. The cause was undetermined in the reporting reviewed. This was an accidental pipeline failure, not an attack.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.