An explosion occurred at the Avangard military plant in the city of Sterlitamak, Republic of Bashkortostan, Russia, which belongs to the Russian corporation Rostec, according to Russian media sources. The incident occurred while a repair crew was dismantling a pipeline in one of the workshops. Three crew members were killed. The causes of the accident are under investigation. The Russian Investigative Committee suggests that workers violated safety procedures during the cutting of pipes, causing a gas-air mixture to ignite, according to Radio Svoboda, citing other Russian media. The Avangard p…