In Ohio, one person was killed and 12 others injured Monday as a large explosion tore through a metal factory outside Cleveland, shattering windows, scattering molten debris around the site and setting vehicles on fire. Residents of Oakwood Village reported a scent like “burning oil” after the explosion, which sent a huge plume of smoke billowing into the sky. Records from the Occupational Safety and Health Administration show the factory’s operator, I. Schumann & Co., was recently cited in several complaints. In one instance, a worker suffered third-degree burns. In another case, OSHA cited the company for a “serious violation” over its control of hazardous energy.