Cardiff University's main building has been evacuated after a chemical spill.
Emergency services were called to the "contained incident" on the city's Park Place at 11:13 BST on Tuesday.
The university said there were no reported injuries but a "small number" of people were being checked by paramedics as a precaution.
South Wales Police said the road between Museum Place and Cathays Terrace was closed and urged people to avoid the area.
The Welsh Ambulance Service said it sent a rapid response vehicle and two emergency ambulances to the scene after being alerted to the incident.
