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 scene.
The three patients were treated at the scene before being taken to Altnagelvin and Causeway Hospitals.
The PSNI has appealed to anyone with any information to contact them.