Pennsylvania leaders want answers as to what caused Monday's deadly explosion at U.S. Steel's Clairton plant.

The tragedy has rocked the Mon Valley, and its congresswoman wants answers. Democratic Congresswoman Summer Lee is appreciative of U.S. Steel's efforts to get to the bottom of this, but she said this can never happen again.

Lee said leaders need to make sure the people who work in these facilities, whether here in Clairton or other parts of the Mon Valley, are in a safe environment.

"So that we can get the full truth on not just what happened, how it happened, and what do we do now, what needs to be done to make sure that something like this never happens again," Rep. Lee said.

According to Lee, the Occupational Safety and Health Administration and the Environmental Protecti

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