Plum Borough, PA - At 11:36 A.M. on April 5th, firefighters were dispatched to a reported commercial structure fire located in the 1900 block of Eastern Avenue at the Affival company, which produced steel products.

Dispatch advised crews that it was reported that a machine exploded and there was now a fire in the building. Dispatch then advised responding crews that the building contained titanium and calcium powder. Command requested that the Allegheny County Haz-Mat team also be dispatched to the scene.

Crews arrived to find a fire in the rear of the building and were quickly able to contain it using dry powder. About a dozen employees were inside the building when the explosion occurred. Three of them were taken to the hospital for precautionary reasons.

The cause of the explosion is still under investigation.