Authorities say two of the 37 people sickened by an ammonia leak in suburban Chicago last week remain hospitalized in serious but stable condition.

Lake County Sheriff’s spokesman Christopher Covelli said Monday that the other 35 people who were treated after Thursday’s leak have been discharged, including all first responders. Eleven firefighters and three law enforcement officers were among those injured.

Covelli says the two who remain hospitalized have been upgraded from critical to serious condition and moved out of intensive care.

In this still image from video provided by ABC7 Chicago, a fire engine sprays water on a container of the chemical that farmers use for soil after after anhydrous ammonia leaked Thursday, April 25, 2019, in Beach Park, Ill. (ABC7 Chicago via AP)
In this still image from video provided by ABC7 Chicago, a fire engine sprays water on a container of the chemical that farmers use for soil after after anhydrous ammonia leaked Thursday, April 25, 2019, in Beach Park, Ill. (ABC7 Chicago via AP)

A tractor driver was towing tanks of anhydrous ammonia from Pleasant Prairie, Wisconsin, to an Illinois farm when the chemical leaked, creating a toxic gas cloud.

The leak occurred in Beach Park, about 40 miles (65 kilometers) north of downtown Chicago. The National Transportation Safety Board is investigating.

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