Nearly 20 prison guards at a rural Illinois prison were hospitalized Wednesday afternoon for unknown reasons.
The 18 guards were working at Graham Correctional Center in Hillsboro, about 50 miles northeast of St. Louis, local NBC affiliate WAND reported.
A union representative said the guards responded to an inmate in distress, then became light-headed and nauseous, according to WAND. All 18 guards were in stable condition by Wednesday night.
The guards were tested to determine if they were exposed to a foreign substance, local Fox affiliate WRSP reported. No such substance was immediately identified.
The Illinois Department of Corrections told local reporters: “The matter is being investigated. There is no further information at this point.”
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