The Rock County Courthouse was closed for the day after a chemical incident.
The Rock County Sheriff’s Office said that a facilities management worker was mixing chemicals to treat water for the building’s air cooling system at about 8:30 a.m. Friday when the fire alarm activated.
Deputies began evacuating people and the Janesville Fire Department’s hazardous materials team responded. The building was closed about an hour later.
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A worker exposed to the chemical cloud was taken to the hospital and one deputy was treated at the scene and released.
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