A woman who was stabbed to death in an Aldi supermarket was working in the store at the time, the town's mayor has said.
The 30-year-old was attacked in the store in Skipton, North Yorkshire, at about 15:30 GMT on Thursday.
Customers and colleagues helped by pinning down the attacker before police arrived. A 44-year-old man has been arrested on suspicion of murder.
Skipton Mayor Andy Rankine said the whole town was in shock over the death.
Mr Rankine said: "Skipton is a small but close-knit community where most people know each other.
"We are in shock about the sad events of yesterday where a store worker was murdered whilst going about her duties."
People have left messages on a community Facebook page, saying the married victim was a mother and describing her as a "bubbly, lovely girl".
Another customer said she had seen the Aldi employee earlier that day wearing a Christmas jumper on shift.
Shoppers had described how they were left terrified when the attack happened at the store in Keighley Road, with witness saying everyone "screamed and ran up and down".
A spokesperson for North Yorkshire Police said: "The suspect was initially detained by brave members of staff and public, before he was arrested by officers who were quickly on scene.
"He was taken into custody on suspicion of attempted murder, but it has now turned into a murder investigation despite the efforts of medics to save the victim."
He added that they were not in a position to identify the victim at this stage, but her family was being supported by specialist officers.
The force said the incident was not terror-related or believed to be a hate crime.
In a statement released on Friday, Aldi said the store would be closed until further notice to allow police to carry out investigations.
A spokesperson said: "We are working with the police following an incident at our Skipton store."
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