Authorities say it's a hydrochloric acid spill in the basement of J&M Plating at Kishwaukee St. and Beltline Rd.

The acid is used to make fertilizers, dyes, as well as clean metal products. It's highly corrosive and can cause respiratory problems if inhaled.

There were 15 workers inside the plant at the time, but no one was hurt because of the spill. However, fire fighters say there was one injury from an unrelated incident.

We'll bring you more updates as they become available.