Eight teenagers – six boys and two girls aged between 15 and 17 – have been arrested on suspicion of murder after a 16-year-old boy was stabbed in Bath.
A 35-year-old woman, who was also stabbed in the incident, has been discharged after being treated in hospital.
Avon and Somerset Police said emergency services were called to an address in Eastfield Avenue shortly after 11pm on Saturday following reports of a stabbing.
People tried to help the boy with first aid before paramedics arrived, but he could not be saved and died at the scene.
Police say a post-mortem examination will take place in due course.
The arrests were made from a bus in Lansdown Lane at 11.30pm.
Chief Inspector Ronald Lungu said: “This is a tragic incident and our thoughts this morning are very much with the family of the boy who has died.
“They were informed of what happened as soon as possible and are understandably devastated. Specialist family liaison officers will now be assigned to them to provide them with support and keep them updated.
“Officers arrived at the scene within minutes of the first call being received and an investigation into the incident is already being carried out, led by the Major Crime Investigation Team.”
The force said they will be taking formal statements from witnesses and have urged people to come forward if they have not done so already.
Authorities said the area will see a significant police presence on Sunday and for the next few days, while “officers and police staff carry out a number of actions including forensic examinations, a review of CCTV footage and house-to-house inquiries”.
Mr Lungu added: “There is currently a large cordon in place on Eastfield Avenue while we carry out these enquires and I’d like to thank those residents whose properties are impacted by this for their patience and understanding.
“I appreciate this is a concerning incident and I’d like to reassure people a thorough inquiry is taking place, however, should anyone have any questions I’d encourage them to make contact with their local neighbourhood policing team, who’ll be carrying out extra patrols in the area.”