Multiple explosions at a steel plant near Pittsburgh have killed two people and left 10 others injured on Monday, according to authorities. Video captured a massive black plume of smoke rising from the U.

CLAIRTON: 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.

A fire Monday at the US Steel mill, 20 miles south of Pittsburgh, hurt 10; 1 person is missing. Residents within a mile are advised to stay indoors.