A murder investigation is under way after a 17-year-old boy was stabbed multiple times in Limavady, County Londonderry.
The incident happened at about 21:35 GMT in Woodland Walk on Friday. The victim later died in hospital.
Another man, aged in his 50s, was taken to hospital where his condition has been described as stable.
Five men have been arrested and are assisting enquiries, the Police Service of Northern Ireland said.
Officers have cordoned off part of a housing estate in the town and forensic markers have been placed near the cordon at Woodland Walk.
The Northern Ireland Ambulance Service (NIAS) said three people were taken to hospital.
Four emergency crews, two rapid response paramedics and an ambulance officer were sent to the incident following a 999 call.
At the scene - BBC reporter Catherine Morrison
Neighbours of the teenager, who was stabbed to death in the town, have spoken of their shock and distress at the incident.
One man described the victim as a "lovely young guy" who would often be seen playing football with the younger children in the community.
He said young people from the area tried to help the victim, wrapping him in blankets until the emergency services arrived.
An area of grass in between houses has been cordoned off, as has an alleyway running alongside houses.
A police presence remains at the scene.
The NIAS said three patients were treated at the scene before being taken to Altnagelvin and Causeway Hospitals.
The Police Service of Northern Ireland has appealed to anyone with any information to contact them.