Men threw a cigarette butt into the sewer

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In Khasavyurt, Dagestan two utility employees came to check the sewerage and carry out technical work. As it turned out later, a large amount of acetylene (flammable gas) had accumulated there. The housing and communal services employees did not know this, and for some reason one of them (in violation of safety rules) threw a cigarette butt inside. There was a powerful explosion, the concrete slab above the sewer literally flew into the air, and two workers with it. They died on the spot. The blast wave and debris also destroyed the car in which the men arrived.