Explosion black smoke rising in the air, explosion at a factory of a steel company in Pennsylvania, USA

On August 11th local time, an explosion occurred at the Clayton factory of a steel company in Pennsylvania, USA, with multiple medical helicopters dispatched to the area. Local media reports that the explosion has caused one fatality and multiple injuries. According to the American Columbia Broadcasting Corporation, thick smoke from the explosion can still be seen several kilometers away. The mayor of Clayton requested for multiple ambulances to be sent to the scene. Local authorities have declared a "mass casualty event" has occurred.