No one was seriously hurt, but EMTs did check out one person at the scene.

Investigators shutdown the area to check the air quality because no one was sure what chemicals caused the blast.

"I just know it's optics. I don't know the type of chemicals that they use. There were reports of arsenic and selenium used in the process, but we don't know exactly what caused the explosion or what might have been disrupted as a result of the explosion," said fire Lt. Jared Guhl.

Firefighters say there is no threat to the public, but there is a lot of damage in the room where the explosion happened. Once HAZMAT workers contain the scene, they will leave it to the company to clean up.