A 38-year-old woman has died after a disturbance in a newsagents in St Enoch's Square in Glasgow city centre.
Police were called to the McColl's store at about 1155 BST.
It is understood the woman, who was an employee at the shop, was stabbed.
A man, believed to be in his 40s, was also injured in the incident. Police said they were treating the woman's death as murder. It is understood she may have known the injured man.
Officers were still at the scene on Tuesday afternoon, and an area was cordoned off while forensic experts carried out investigations.
The man was taken to Glasgow Royal Infirmary. Staff described his condition as serious but stable.
Another member of staff, along with several shoppers, were in the store at the time of the disturbance but they were not injured and did not require hospital treatment.
Detectives appealed for any witnesses to contact them.
Staff in nearby shops spoke of their shock and said they had heard the woman, in her late 30s, had been stabbed by a man who then stabbed himself.
Passers-by said they had seen a man covered in blood being brought out from the shop on a stretcher.
Stewart Kinnon, 47, said: "I was in the shop about 20 minutes before it happened. It's a terrible thing to happen.
"She was a pleasant woman, all the staff in the shop are pleasant."
A worker at the William Hill bookmaker next door said: "It's terrifying. We're pretty shaken."
A McColl's spokesman said: "We are aware of the incident. Police are carrying out investigations and we are co-operating fully."
A mobile police office was set up in the square.