ArcelorMittal plant in Steelton.

ArcelorMittal plant in Steelton. Paul Chaplin | pchaplin@pennlive.com

Update

A gas explosion on Sunday afternoon destroyed a building on the grounds of the ArcelorMittal steel plant in Steelton, according to Mayor Thomas Acri.

No one was injured in the explosion and a subsequent fire, which was reported after 1 p.m.

The gas leak started in a building that is approximately 45-by-50 feet and is used partly as a washroom, Acri said. No one was inside the building at the time of the explosion. The cause of the gas leak remains under investigation.

The fire went to a second alarm and brought more than 90 first responders to the grounds of the steel plant. Officials from UGI Utilities were also on scene to investigate and help firefighters, who were battling a few hot spots.

The American Red Cross also arrived to assist first responders with beverages and refreshments.

The steel plant was first established in 1867 and was formerly part of the Bethlehem Steel Corp. ArcelorMittal says the plant was the first built specifically for the production of steel in the United States.