A section of a busy Glasgow shopping street has been cordoned off by the emergency services after two people were struck by a bus.
The incident happened at about 2.30pm at the corner of Queen Street and Argyle Street in the city centre.
Police and ambulance crews and a number of fire engines are on the scene.
A Police Scotland spokeswoman said: "We received a report about 2.30pm that two people had been struck by a bus at the corner of Queen Street and Argyle Street in Glasgow. Emergency services are on the scene.
"The road is closed with diversions in place."
There is no detail available yet on the age of those involved in the crash, their gender or the seriousness of their injuries.
Police were unable to comment on reports that at least one person has been trapped underneath the bus.
It is understood a man and a woman suffered very serious injuries in the collision.
The casualties have been taken by ambulance to Glasgow Royal Infirmary.
The Scottish Fire and Rescue Service said it had up to 25 firefighters on the scene, who used airbags to release two people from underneath the bus.
A spokesman said: "Scottish Fire and Rescue Service crews attended an incident in Queen Street in Glasgow city centre following a call from ambulance control around 2.35pm.
"Four appliances from Calton and Cowcaddens community fire stations attended the incident along with a heavy rescue vehicle from Easterhouse.
"The firefighters, who were working closely with paramedics and doctors, used airbags to release two people from beneath a bus.
"Both casualties were taken to Glasgow Royal Infirmary by ambulance."
A spokesman for the Scottish Ambulance Service said they had "a number of ambulance crews" on the scene as well as a special operations team and a trauma team.