What happened

Contractors repairing a bypass-line leak on a shut-down hydrotreater unit were swapping flange bolts around 12:50am when the pipe holding the flange ruptured, releasing hydrocarbons that ignited; the resulting fire burned for nearly eight hours. Four contractors were injured, three airlifted for treatment, with no fatalities. This was an accidental industrial incident, 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.