At least 37 were hospitalized after an ammonia gas leak in a northern Chicago area on Thursday, April 25.
The gas caused a toxic cloud to linger for several hours. Seven of the hospitalized victims are in critical condition.
A tractor towing two, two-ton containers of anhydrous ammonia at approx. 4:30 a.m. sustained a leak in one of the tanks.
According to Lake Forest Fire Chief Mike Gallo, it created a chemical cloud lingering over Beach Park, which is 40 miles north of Chicago.
Nearly two dozen law enforcement agencies and firefighters reportedly responded to the scene, causing several of them to be hospitalized.
Anhydrous ammonia is a colorless gas that causes breathing difficulties, burns, blisters. The gas is fatal someone breaths in high concentrations. It usually used to add nitrogen to soil by farmers.
Authorities have yet to release what was the cause of the leak. However, it was reportedly contained within a few hours.
Residents within a one-mile radius were told to stay indoors and shut their windows during the leak. Schools were closed for the day.
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