Four people were hospitalized with cuts and other injuries after a powerful explosion ripped through a chemical factory in the northwestern Russian city of Kingisepp.
The blast destroyed a two-story building at the Polyplast plant in the city, 140 kilometers southwest of St. Petersburg, Leningrad Oblast Governor Aleksandr Drozdenko said.
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Drozdenko said the explosion was most likely set off by sparks flying from a grinder operating near a barrel containing the flammable chemical compound saltpeter.
Rescue teams, police, local authorities, and environmental hazard teams rushed to the site, and the explosion was under investigation.
The Polyplast plant is a part of a larger industrial complex and employs about 185 people. It produces chemical ingredients used in construction materials.
Kingisepp has more than 46,000 residents and is located close to the Estonian border.
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This article originally appeared on Radio Free Europe/Radio Liberty. Follow @RFERL on Twitter.