People at a nearby restaurant described the building shaking and going out and seeing the fire.
A large plume of smoke was seen over the refinery, but it unclear what caused the incident.
Artur Rehi on MSN
Massive explosion rocks Russian ammonium nitrate plant
A massive explosion has rocked a Russian ammonium nitrate plant, sending shockwaves and plumes of fire into the sky. Watch the footage and see the catastrophic scale of the blast.
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