Officials with the ATI Flat Rolled Products plant in western Pennsylvania are investigating a molten steel explosion that rattled nearby homes and could be heard 10 miles away.
ATI spokesman Dan Greenfield told the (Tarentum) Valley News Dispatch the explosion occurred about 11 p.m. Tuesday outside the plant in Harrison Township. That's about 25 miles northeast of Pittsburgh, along the Allegheny River.
Greenfield said a contractor was cleaning a slag pot used to melt scrap metal when some of the molten scrap came into contact with water, causing the explosion. Nobody was hurt.
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Township police said the blast broke an apartment window and shook homes enough that automatic fire and car alarms were activated.
Greenfield said ATI wants "to make sure that what happened never occurs again."