Firefighters and their fellow emergency responders attended an incident at a hotel in Edinburgh.
Scottish Fire and Rescue Service (SFRS) crews were sent to Festival Square in response to a call from ambulance control received shortly before 1:15pm today (Wednesday, 13 July).
With a report of the possible involvement of potentially hazardous materials the resources mobilised included specialist SFRS officers trained in the safe management of such incidents.
Group Manager Alan Horberry, the SFRS incident commander, said: “The incident involved an irritant gas that was produced as a result of the accidental mixture of chemicals in a fumigation machine.
“Firefighters in breathing apparatus ensured the building was safely evacuated. We were working alongside our police and ambulance colleagues.
“On scene tests identified the nature of the substance involved and that it had been confined to the room where the incident originated.”
Two people were taken to hospital after being treated by ambulance personnel at the scene. One has since been discharged.
The incident involved six SFRS appliances, the last of which was stood down around 3:40pm.