The cause of the blast remains under investigation.
Crews were called Tuesday night to a report of an explosion inside the Liberty Casting factory, according to the Delaware County Emergency Communications Center.
Firefighters and medical personnel are on scene after a dispatcher told our media partner 10TV.com (WBNS) in Columbus that they took a report of an explosion in the factory in Delaware, about 40 miles north of Columbus.
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There was no immediate information on injuries, 10TV reported.
Liberty Casting specializes in gray, ductile and high alloy iron casting, according to the company's website.
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