An investigation is under way into an ammonia leak at the Baiada Chicken Factory at Beresfield on Friday night which has left nine people in hospital.
350 workers were evacuated and 11 taken to hospital following the incident.
In a statement, the company says the leak occurred during the installation of a new refrigeration equipment outside the plant by a specialist service provider.
It's not the first time an incident like this has occurred at the plant.
In March 2016, 43 employees were overcome by Chlorine Dioxide fumes - the company was subsequently fined $15,000 by the Environment Protection Authority, while 1 employee was taken to hospital in December that year after a minor ammonia leak.
