Two people have been taken to hospital after an ammonia leak at a freezing works in Pukeuri, north of Oamaru, last night.
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Fire and Emergency was called about 10.20pm to the Alliance Group site near State Highway One.
Southern communications shift manager Simon Lyford said three crews and a hazardous material command unit attended.
Firefighters found a cloud of ammonia on site and helped evacuate staff who were still in the building.
Lyford said police and ambulance officers also attended.
