Rescue operation underway after explosion at Pennsylvania steel plant

Incident Overview - An explosion occurred at a US Steel fabricating plant near Pittsburgh, Pennsylvania [1] - The incident has been designated a mass casualty event, unlocking additional resources [3] - Rescue operations are underway for workers reportedly trapped under rubble [1][6] Impact and Casualties - One person has been confirmed dead [2][4][6] - Two patients are being treated at one local hospital, and seven at a second health network [2][5] - Dozens of people are reported injured [6] Response and Investigation - Pennsylvania Governor Josh Shapiro's administration is in contact with first responders and has offered assistance [2] - The incident is under active and ongoing investigation [5] - The Lieutenant Governor urged people to stay away from the area to allow emergency crews to work [7] Facility Details - The US Steel Claritin Cokeworks plant is a large facility, almost 400 acres in size [4] - The plant employs approximately 1,200 workers [4]