An explosion at a U.S. Steel plant south of Pittsburgh killed two people and injured more than 10 others. The CEO 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.

Democratic Gov. Josh Shapiro and plant executives vowed Tuesday to do whatever is necessary to prevent it from happening again.

“We owe them an answer for

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