An explosion at an automotive supply plant in Ohio injured nine workers, two of whom had to be sent to the hospital.

The blast occured on Tuesday evening when a hydraulic line malfunctioned at the Faurecia Interior Systems plant in Northwood, Ohio, a company spokesman told the Toledo Blade.

Natalie Humphrey, a plant employee, was standing close to the site of the explosion, but was not injured.

"I was standing right next to [the pre-assembly line] when I heard a loud explosion that sounded like a cannon, " Humphrey, who works on the pre-assembly line, told the news source. "And then I saw two people lying on the ground and black smoke everywhere."

Alvin Tarrent, the plant’s United Auto Workers Local 12 committee chairman, told the Blade that two workers needed to be taken to Mercy St. Vincent Medical Center in Toledo.

The plant makes door panel interiors for Chrysler’s Dodge Nitro and Jeep Liberty.

Jule Hovi, the area director for the federal Occupational Safety and Health Administration, told the news provider that the agency will investigate the explosion.