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, Pa. (TNND) — An investigation is ongoing after two people were killed and 10 were injured in an explosion at a U.S. Steel plant near Pittsburgh on Monday, leaving behind smoldering rubble and plumes of black smoke.

At least one person has died, and one person remains unaccounted for, while at least 10 people have been injured following multiple explosions at the U.S. Steel Clairton plant.