CHICAGO (STMW) — A man was killed in an air tank explosion at a machinery manufacturing plant Monday night in northwest suburban Carol Stream.

Chad Nelson, 35, was welding metal machinery about 9:30 p.m. at Maac Machinery at 590 Tower Blvd. in Carol Stream when there was a “catastrophic failure,” according to the DuPage County coroner’s office.

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An estimated 200-gallon air tank exploded while being tested for leaks, according to a statement from the Carol Stream Fire Protection District. There was no fire or smoke in the explosion.

Nelson, of Elgin, suffered severe traumatic injuries and was dead at the scene, according to the coroner’s office.

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Another person who was in the vicinity refused medical treatment, according to the fire protection district.

There were no structural hazards to the building from the explosion, according to the statement.

The Occupational Safety and Health Administration has opened an investigation into the fatality, according to spokesman Scott Allen.

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