A chemical leak in Cardiff left three people hospitalised and nearby residents were told to stay inside and keep their windows shut.
Emergency services including police, fire, and ambulance rushed to Queen Alexandra Docks, Butetown, Cardiff Bay shortly after 11am.
The ambulance service said it sent a rapid response car, ambulance, a duty operations manager and its hazardous area response team to the scene.
Residents near to Queen Alexandra Dock (pictured) in Cardiff have been told to keep their windows and doors shut after a chemical leak hospitalised three people this morning
Emergency services have attended the scene and asked that members of the public do not call in relation to the incident at Queen Alexandra Docks
A spokeswoman for South Wales Police said: 'South Wales Police were called to reports of a chemical leak on Queen Alexandra Dock, Butetown. The fire service have dealt with the incident.
'Three people have been taken to hospital as a precaution. Please avoid the area and keep windows and doors shut if you are in the Queen Alexandra Docks area.
'Please do not contact our control room in relation this incident.'
A spokesman for South Wales Fire and Rescue Service said: 'At approximately 1050 today, 19th June 2022 we responded to a report of a chemical incident at Queen Alexandra Dock, Cardiff.
'We mobilised a number of fire appliances and specialist crews from Cardiff Central, Whitchurch, Maindee, Pencoed,
'Penarth and New Inn.
The incident was a small scale gas release, which was resolved with the assistance of an onsite engineer.
Three workers have been transferred to hospital for precautionary checks. South Wales Police and Welsh Ambulance Service were also on scene.
There is no ongoing risk to members of the public in the area.'