A major city centre road is closed after a "small explosion", police have said.
Glasgow City Council's road department says Cathedral Street is closed from North Hanover Street to Stirling Road.
Emergency services are in attendance and have sealed the road off.
It is understood the 999 response might have been activated due to an incident in a University of Strathclyde building lab.
"Following reports of a small explosion at Cathedral Street #Glasgow, road closures are in place at North Hanover Street to George St, North Frederick St to George Street, George Street to Montrose St & High St to Cathedral St. There is no immediate threat to the public," Police Scotland said.
The council's roads department urged drivers to seek an alternative route, in particular during peak times.
Their statement said: "Due to an ongoing building fire, Cathedral Street is closed from North Hanover Street to Stirling Road.
"Emergency Services are in attendance.
"Drivers are advised to seek an alternative route, in particular during peak times."
Stagecoach warned that there services were being diverted as a result of the blaze.
#ServiceUpdate there’s a road closure on cathedral street, our x19, x25,x25a will be diverted via baird street, we will not be able to serve cathedral street, we're sorry for any delays, rest assured we’re trying to get to you as quickly as we can! pic.twitter.com/hVHAvYLLbE
— Stagecoach West Scotland (@StagecoachWScot) June 5, 2023