CHICAGO (CBS) — Eleven people went to the hospital Monday, after firefighters responded to a carbon dioxide leak at a meat packing plant in the Lower West Side neighborhood.

Around 11:45 a.m., the Chicago Fire Department responded to reports of exposure to carbon dioxide at Battaglia Distributing Company meat packing plant at 25th and Ashland.

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Crews brought in large fans to vent the building, and ten ambulances were brought in to help treat employees exposed to the carbon dioxide.

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Eleven people were taken to hospitals after complaining of feeling ill, but Fire Department officials said there were no serious injuries.

The situation was secured by about 12:30 p.m.

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It was not immediately clear what caused the carbon dioxide leak.