AKRON, Ohio — At least 13 people were injured, two critically, Monday after an explosion at a metals plant in Ohio sparked a massive 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.

Oakwood Fire Captain Brian DiRocco told reporters that 13 people were transferred to several area hospitals and another was still being examined. According DiRocco, one person was pulled from the debris and was being treated while being taken to a medical helicopter. 

DiRocco told News 5 Cleveland the fire was under control Monday evening.

“The bulk of the fire is out, and responding firefighters are just working on a couple of hot spots,” DiRocco said.

Matt Barkett, chief client officer for I. Schumann & Co., released a statement Monday evening saying the origin of the explosion is still unknown. He confirmed employees were injured and that the facility sustained significant damage.

“Our efforts now are focused on supporting the first responders who came on scene quickly to help our employees,” Barkett said. “The safety and health of our employees is our top priority and we commit to ensuring they receive the medical care they need.”

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MetroHealth spokesperson Dorsena Koonce said it was treating four people, with two of them in critical condition. A University Hospitals official said seven patients were being treated at Ahuja Medical Center. 

Jeff Huhn, who works across the street, heard the explosion.