Dan Martin
BBC News, East Midlands
BBC
Police cordoned off the entrance to the branch in Long Row
A 17-year-old boy has been stabbed in the chest in a Primark store in Nottingham.
Nottinghamshire Police said the teenager was attacked inside the shop in Long Row at about 11:30 GMT on Sunday.
Officers believe there was an altercation between a group of young people outside the store before the stabbing happened.
The victim was treated at the scene by paramedics and was taken to hospital with serious injuries, the force added.
The force is appealing for witnesses to come forward
Police say a suspect left the scene in the direction of Old Market Square.
Det Insp Paul Shortt said: "This was an appalling act of violence carried out in full view of members of the public.
"A team of detectives is now working to understand exactly what happened in the moments before, during and after this incident."
The force asked anyone with any information to get in touch.
A Primark spokesperson said staff were assisting the police investigation and that the store would be closed until further notice.
They added: "Our thoughts are with the victim and we are focused on supporting our colleagues who were in store at the time."