A maintenance worker was killed and more than a dozen were injured Monday after an explosion at an Ohio metals plant sparked a large fire, authorities said.  The blast and three-alarm blaze rocked the I. Schumann & Co. alloy factory in the Cleveland suburb of Oakwood Village shortly before 3 p.m. Smoke from the explosion was seen for miles as emergency crews responded to the scene. The origin of the explosion is still unknown, officials said Monday. It occurred just 70 miles north of East Palestine, Ohio, where a train derailed releasing toxic chemicals on Feb. 3. Head to the link in our bio to learn more. (🎥: Tracey Scherma/LOCAL NEWS X /TMX; 📸: Michael Swensen/Getty Images)