THREE people were taken to hospital after potentially dangerous chemicals were issuing fumes in a chemistry lab at the Glanbia cheese factory in Magheralin.
Two fire appliances from Lurgan and two from Lisburn attended a special service call to the factory at 4pm on Wednesday afternoon.
As a precaution the building was evacuated.
Fire personnel wearing breathing apparatus and gas tight suits entered the room and ventilated the area. Using gas monitoring equipment they monitored the surrounding air.
Three people were taken to hospital as a precautionary measure.