“Around 19:30 on April 25 ... in the blast furnace shop of Ural Steel JSC in the city of Novotroitsk there was a leak of blast furnace gas, resulting in the deaths of three employees of the enterprise,” the regional insurance company said in a statement.
A criminal case has been opened.
Investigators visiting the scene.
Earlier it was reported that four people died due to a gas accident in South Korea.