ASHLAND, Ky. (AP) — One person has died in an explosion and fire at the AK Steel Corp. coke plant in Ashland.

Ashland Fire Department Battalion Chief Scott Boyd says the blast happened around noon. He says officials don’t yet know the cause of the incident, which is being investigated by the state fire marshal’s office as well as the plant.

Boyd says the fire happened in the plant’s byproducts area. He said there were no other injuries as far as he knew.

The person who died was a contractor working at the plant, according to a statement from James Wainscott, chairman, president and CEO of AK Steel. His identity has not been released.

The steelmaker is based in West Chester, Ohio. A person answering the phone after hours said no one was available to comment.

Wainscott said in the statement that the company was “saddened” by the death and would investigate, The Independent in Ashland reported.