SHIVELY, Ky. —

An explosion at a plant in Shively killed one worker over the weekend and was contained to the exterior of the building.

It happened at the AAK Louisville plant along Seventh Street Road.

AAK specializes in plant-based oils and is headquartered in Sweden, with offices worldwide.

This specific facility in Shively bleaches, hydrogenates, deodorizes, and refines soybean oil, according to a permit filed with the city.

Officials say the explosion stemmed from a hydrogen tank conversion process.

This is the second incident within nearly a year at this plant.

There was a fire on one of the plant's exterior conversion tanks in December, but no one was killed.

Metro Hazardous Materials, Metro Sewer District, and the Louisville Metro Health Department were all called to th

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