Two people were taken to hospital with breathing difficulties following a chemical incident at a Lincolnshire factory.
More than 30 firefighters were called to the premises on Sluice Road, Holbeach St Marks, just before 2100 GMT on Saturday.
Specialist crews were also called to the scene and the area cordoned off.
A spokeswoman for Lincolnshire Fire and Rescue said a clean-up operation had been completed and the area made safe.
It is thought the incident happened during the cleaning of a food preparation area after disinfectant reacted with an unknown substance.