Two people are dead and four others have been hospitalized after being exposed to hazardous material at a townhouse in the suburban Chicago town of Des Plaines, authorities said on Thursday.

The Chicago Tribune reports that both of the dead are men. Their names have not yet been released. The hazardous materials in question have also not been named.

According to the New York Times, all four people hospitalized are officers from the Cook County Sheriff’s Department.

The chief of the North Maine Fire Protection District, Richard Dobrowski, told reporters that the officers were the first to arrive at the scene, and that they went to the hospital because “they started to feel a little sick” and may have suffered from “breathing difficulties.”

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