A blast at a major explosives plant in central Russian Federation on Saturday injured at least 19 people and two were reported missing, officials said.
According to a source quoted by Interfax news agency, the factory was used to produce and store high-explosive bombs.
Firefighters say they do not know if anyone else is still inside the building.
Russia's emergencies ministry said four of the injured were in serious condition.
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The regional health ministry said 19 people were treated for injuries after the explosion; none of the injuries were considered severe.
It adds that 15 people were hospitalised, but no one had died.
He was blamed for an explosion that occurred in April and also destroyed a section of the plant.
Smoke rises after an explosion in a plant manufacturing TNT explosive in Dzerzhinsk.
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Images on social media showed a large cloud of smoke after the explosion.
The deputy governor of the Nizhny Novgorod region, Dmitry Krasnov, told Russian state television that "two people are missing".
Earlier, a local health official said that most victims were suffering from "shrapnel wounds of mild and moderate severity".
The blasts, around midday (0900 GMT) were heard all over the town of more than 230,000 residents and shock waves smashed or damaged windows in around 180 buildings, city authorities told TASS news agency.
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The Ministry of Emergency Situations said the fire is now spread over a 100 square meter area.