A massive industrial fire broke out at a chemical plant in the U.S. state of Illinois on Monday.  
The fire will likely be allowed to burn for days as officials hope to protect the nearby river from chemical-polluted run-off water from fire hoses. 
The Chemtool plant manufactures oil-based lubricants. Residents have been told to stay away from the area at least for a few hours. 

It is unclear how the fire started.

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