A carbon monoxide leak at a Fond du Lac plant sent eight people to the hospital Monday afternoon.
Emergency responders were called to Quality Packages at about 2:30 p-m.
Upon arrival, crew members say they treated several workers complaining of the symptoms of carbon monoxide poisoning.
Elevated levels of carbon monoxide were measured in the warehouse which was evacuated and ventilated.
Investigators think the leak may have been caused by a forklift in the warehouse.
