Officials are still investigating the cause of a Pennsylvania steel plant explosion that killed 2

CLAIRTON, Pa. (AP) — An explosion rocked a steel plant outside Pittsburgh on Monday, leaving two dead and 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 sky in the Mon Valley, a region of the state synonymous with steel for more than a century.