CLAIRTON, Pa. (AP) — Investigators are working to determine the cause of an explosion that rocked a steel plant outside Pittsburgh, leaving two dead and more than 10 others injured , including a person who was rescued from the smoldering rubble after hours of being trapped.

The explosion sent black smoke spiraling into the midday Monday sky in the Mon Valley, a region of the state synonymous with steel for more than a century.

Allegheny County Emergency Services said a fire at the plant in Clairton started late Monday morning. Officials said they had not isolated the cause of the blast.

The rumbling from the explosion, and several smaller blasts that followed, jolted the community about 15 miles (24 kilometers) southeast of Pittsburgh. Amy Sowers, who was sitting on her porch less t

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