Workers at the former Oak factory in Hexham had to be evacuated over the weekend after an ammonia leak at the site.
According to The Herald, the minor leak came from a valve in the old section of the factory, which is now owned by the National Foods plant.
Fire brigade crews arrived at 6.30am on 21 April and hazmat crews identified the leak and repaired the pipe.
While workers were evacuated, no one was harmed as a result of the leak.