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.

READ MORE: Families Fight To Keep Memorial Trees Offered Through Chicago Park District After Being Told Of Golf Course Plans

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

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.

MORE NEWS: Protesters Pack Logan Square Over Police Shooting Of Adam Toledo

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