Pennsylvania Gov. Josh Shapiro said that U.S. Steel is committed to cooperating in the investigation of an explosion Monday that killed two people and injured more than 10 others at a steel plant in Clairton.

"It is dangerous work that they do. It shouldn't be as dangerous as it was yesterday," Shapiro said during a press conference outside the steel plant on Tuesday.

"We owe them an answer for what happened. We owe them an answer to their questions, and we owe them for their sacrifices,” he added.

Allegheny County Executive Sara Innamorato also said she had assurances from U.S. Steel that the company would continue to cooperate fully with investigators.

On Monday an explosion at a the U.S. Steel plant south of Pittsburgh killed two people and injured more than 10 others.

The Allegheny County Police Department said five people were hospitalized in critical but stable condition Monday night, and five others had been treated and released. Multiple individuals were treated for injuries at the scene, but the department said it did not have an exact number.

U.S. Steel CEO David Burrit has vowed to find out what caused Monday's blast while the workers' union says it will make sure there's a thorough investigation.

The plant, Clairton Coke Works, is one of four major plants in Pennsylvania owned by U.S. Steel, an icon of the domestic steel industry and American industrialization.

The company is now a subsidiary of Japan’s largest steelmaker, Nippon Steel, after a nearly $15 billion deal was finalized in June.

The combined company is the world’s fourth-largest steelmaker in an industry dominated by China.