Fire at Nizhnekamsk Plant Injures Over 70
At least 2 killed, 70+ injured.
Gas explosion from pressure loss in synthetic rubber unit.
Sibur reports 2 deaths, 20 hospitalized.
TASS: 3 dead, 6 missing, 70 injured.
Mayor: windows blown out in apartments.
Airport restrictions imposed.
Fire contained, no spread risk.
No environmental threats detected.