WATCH: One dead, 10 injured in explosion at Pennsylvania steel plant, officials say

One person has died, one is unaccounted for and 10 are injured following an explosion at a Pennsylvania steel plant on Monday, local police said.

​One person has died, one is unaccounted for and 10 are injured following an explosion at a Pennsylvania steel plant on Monday, local police said.   One person has died, one is unaccounted for and 10 are injured following an explosion at a Pennsylvania steel plant on Monday, local police said.