MarkWest: Explosion at MarkWest facility in Washington County injures four, one critically

An explosion at a MarkWest natural gas processing plant on Thursday evening injured four workers, with one in critical condition. The explosion, which parent company Marathon Petroleum told KDKA occurred around 6 p.m., took place at a facility in Washington County. The explosion was followed by a fire at the plant, which led to the injury of the four workers. The employees were airlifted to two Pittsburgh hospitals: UPMC Mercy and West Penn. In a statement, MarkWest described the explosion as...