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A preliminary investigation revealed that containers containing anhydrous ammonia were towed by a tractor on Green Bay Road to Beach Park, a village north of Chicago, Sgt. Christopher Covelli of the Lake County Sheriff's Office said.
The spill created a plume of chemical smoke, Covelli said.
A sheriff's sergeant, his deputy, a Zion policeman and 11 firefighters Some of the people who responded to the scene and inhaled the vapors are in the hospital, said the Lake County Sheriff's Office.
The leak has since been contained, said Mike Gallo of the Lake Forest Fire Department. Officials monitor the plume and advise anyone within a kilometer radius of the spill to stay indoors with the windows closed and keep the air conditioning and heating off.
The oil spill also resulted in the closure of several Beach Park schools, police said.
The on-site shelter request for Beach Park has been lifted, the Lake County County Sheriff's Office announced on Thursday morning on Twitter. Door-to-door checks were carried out to ensure that no one was in medical distress at home, the sheriff's office said.
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