What happened

A storage tank failed at a power and fuel facility in the Kayerkan area of Norilsk, releasing about 21,200 tonnes of diesel beyond containment into soil, the Bezymianny Stream and the Daldykan and Ambarnaya rivers. The emergency cleanup ran until November 2020, followed by continuing environmental monitoring and restoration. This was an industrial accident, 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.