Four people were taken to hospital after a suspected chemical leak at a seafood factory.
Emergency services were called to Macrae Edinburgh in Livingston, West Lothian, at about 2.30pm on Wednesday.
Workers within the building, part of Young's Seafood, were evacuated after the alarm was raised.
A Scottish Ambulance Service spokeswoman said: "We dispatched one ambulance, a manager and our special operations response team to the scene. Two patients were transported to St John's Hospital."
She added a further two took themselves to seek treatment.
Two of the employees who attended hospital suffered minor injuries, according to the firm.
The factory was to be cordoned off until the fire service deemed it safe to re-enter, although it is expected to reopen on Thursday.
A Young's Seafood Limited spokeswoman said: "We are providing all possible support to our affected employees while this process continues.
"We expect production on the site to resume tomorrow and our focus is on continuing to provide our customers and consumers with great quality fish and seafood."